Tighten any that might be loose and then check the door again.
How to fix door lock on room door.
In most cases the problem is now fixed.
Shut the door and try to lock it.
Examine the striker plate.
A sticky lock can be annoying.
Try using some graphite powder in the lock.
If you break off a screw head or strip it use an inexpensive device called a screw extractor to remove it.
How to fix a door that will not lock.
Tighten the screws that go into the door and the screws that go into the door frame.
If the malfunctioning lock is in the door handle there will be at least two screws securing the door handle to the door.
If it won t lock open the door.
The striker plate is.
This serves as a great lubricant for locks.
After squeezing the powder in use your key a few times in the door to get the lubricant spread to the components.
Tighten the hinges first if you find that the latch contacts the strike plate too high or too low make sure all the door s hinge screws are tight.
Loosen the knobs a little to relieve some of the pressure on the door and to free up the latch a little.
Slide the latch in and out to see if it moves smoothly and if not the door knob may be too tight.
Repairs range from making minor latch adjustments to repositioning the door.
If it latches securely the problem is solved.
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That s the small rectangular brass plate on the jamb that the striker slips into.
If that doesn t solve the problem try this trick.
If not there is more to look for.
Tighten the hinge screws and then try adjusting the strike plate by loosening its screws and shifting it slightly.
Remove these screws unscrew one side of the door knob and pull the door handle and lock assembly out of the door.
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Remove one of the screws on the jamb side of the hinge and drive in a 3 in.
Do not over tighten the screws or you may strip break them.
Tap the end of a chisel under the door stop on.