There are 2 remedies for this that will help get the latch moving again.
New door lock not latching.
One common problem that is associated with door knobs is that the latch will seem to be stuck or not move easily.
If not there is more to look for.
How to fix a door that won t latch shut in 2 min click show more for all the links as a professional locksmith it s something that i do regularly so.
Step 3 align.
Slide the latch in and out to see if it moves smoothly and if not the door knob may be too tight.
When the doorknob doesn t latch completely and the door won t stay closed the fault usually isn t with the knob but with the strike plate.
While it is possible it isn t functioning properly or is out of alignment it.
How to adjust a doorknob so that it will stay shut.
Door locking problems almost always originate in the door latch not the locking mechanism.
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If not do the lipstick test smear lipstick on the latch and stick masking tape to the strike plate.
Try applying wd 40 or a silicone lubricant if the latch is still catching in the door.
It s a reflection of the durability of the internal door lock types not the amount of security they provide.
When a door latch won t catch it s because the latch doesn t align with the hole in the strike plate.
Loosen the knobs a little to relieve some of the pressure on the door and to free up the latch a little.
How to adjust a door that will not latch.
Some exterior door locks are designed to automatically lock when the door closes.
This can cause the latch to stay inside the door whenever the door knob is turned.
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When your door doesn t latch the problem may not be with the latch itself.
Sometimes you can clearly see the misalignment.
Latch does not move.