Why Won't My Door Latch Retract?

Why the latch stays out

A door latch that won't retract is usually binding. Either the latch bolt is pressed hard against the strike plate because the door has sagged, swollen or shifted, or something inside the handle is dirty, dry, loose or worn out.

Try this first. Push the door firmly shut, or lift it slightly by the handle, while you turn the knob. If the latch slides in, the lock is fine and the door is out of line with the frame. If not, tighten the handle, clean and lubricate the latch, and replace it if it still sticks.

How a spring latch works

Turning a knob or lever rotates a spindle that passes through the door and through a cam inside the latch. The cam pulls the latch bolt back into the door. When you let go, springs return the handle to rest and push the bolt back out.

The bolt has one angled face, and that bevel must face the door frame. As the door closes, the bevel rides over the strike plate, the bolt pushes in, and it snaps out again into the strike opening. So a latch stays out for one of three reasons. The bolt is jammed against the strike, the handle is not turning the cam far enough, or the latch itself is gummed up or broken.

Common reasons a latch stays out

Check whether the strike plate is pinching the latch

Open the door and turn the handle. If the bolt moves freely with the door open but binds once it is closed, the lock is not the problem.

Rub chalk or lipstick on the latch bolt, then close and open the door. The smear on the strike shows where the bolt rubs. For an offset of about 1/8 inch or less, file the strike opening toward the mark. For more, move the strike by enlarging its recess in the jamb and drilling new screw holes. Scrape off any paint on the bolt or inside the strike opening.

Worn or loose hinges let a door sag, so tighten the hinge screws first, and use shims behind a hinge leaf or new hinges for a bad sag. Weatherstripping that is too thick can also hold the door off the strike and block the bolt.

A wood door that sticks only in muggy months is likely swelling with moisture. Moving the strike gets you through the season. For the longer term, lowering indoor humidity helps the door stay put.

Tighten the handle, spindle and set screw

Loose screws let the parts shift out of line, so snug the mounting screws on the inside rose or plate. Many knobs and levers also lock onto the spindle with a small set screw on the neck of the handle, which on some levers takes a 3/32 inch hex wrench. When that screw backs out, the handle slips and turns without pulling the bolt all the way in.

If you reinstalled the handle recently and the latch now retracts only partway, it may not be engaged with the handle mechanism. Take the handle off, reseat the latch so the spindle passes through its cam, and reassemble. A lever that droops or no longer springs back to level has a tired or broken return spring, so plan on a new latch or handle set.

Clean and lubricate the latch

Take off both handles, remove the two screws on the door edge (a round drive-in latch has none, so pry it out gently), and slide the latch out. Latch mechanisms are often greased at the factory, and in dusty spots that grease picks up dirt until the lock runs slowly. Wipe the grit off, work the bolt by hand, and keep cleaning fluids out of any key cylinder.

Use only a lubricant your lock's maker approves, and use very little. Makers disagree. Some call for a small amount of PTFE (Teflon) based lubricant, some allow only graphite inside key cylinders and nothing else there, and some padlock makers rule graphite out. Skip heavy oils, since extra lubricant holds dust on the moving parts and can shorten their life.

Refit the latch with the bevel facing the frame and work the handle several times with the door open.

How to open a door that is stuck shut

Take the load off the latch first. Push the door hard into its stop, or lift it by the handle, and turn the handle at the same moment. A locked bedroom or bathroom privacy lock opens from outside with the small emergency release tool supplied with it.

Next, remove the handle on your side and turn the spindle or latch cam directly with pliers or a flat screwdriver while you pull or push the door.

If the hinges are on your side, the door swings toward you and you can take it off. Support the door with a wedge underneath. Set a nail set or center punch under the bottom hinge pin, tap it upward with a hammer until the head rises, then grip the pin with pliers and twist it out. Work from the bottom hinge to the top, and have a helper hold the door before you remove the top pin, because the door is then held only by the latch and can fall toward you. With all pins out, pull the hinge edge toward you and work the door free of the strike.

Stop if the hinges are on the other side, a deadbolt is thrown, or a pin will not budge after several firm taps. Some exterior hinges use security pins made so the door cannot be lifted off. Prying at the latch edge can split the jamb and the door, and a locksmith can open it without that damage.

When a smart lock or deadbolt is involved

A deadbolt, smart or manual, is a separate bolt from the spring latch, and a stuck deadbolt keeps the door shut even when the latch works.

If a deadbolt runs smoothly with the door open but stalls or binds closed, the bolt and strike are out of line. The hole behind the strike should be at least 1 inch deep so the bolt can extend fully, and a shallow hole will stall a motorized bolt.

For a smart lock, fit fresh batteries first, then rerun the door handing or calibration step from the lock's instructions, especially after a reinstall. A mounting plate fitted too tightly can bind the part that turns the bolt, so loosen it, reposition it, and test again.

Replace the latch assembly

If the latch still sticks after alignment, tightening and cleaning, or the handle spins without moving the bolt, replace it. Check the warranty first, since some major lock brands cover the mechanism with a limited lifetime mechanical warranty and will supply a replacement latch.

Measure the backset, the distance from the door edge to the center of the large hole the handle passes through. Household latches are commonly made for 2-3/8 inch or 2-3/4 inch backsets, and many adjust between the two by rotating and pulling the latch out to its long setting.

Match the faceplate too, either a rectangular plate held by two screws or a round drive-in latch tapped flush with a wood block and hammer. Install the new latch with the bevel facing the frame, use the strike that comes with it, and test the handle with the door open before you close it.

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