If it won t lock open the door.
They dont make my door handle anymore.
Now try closing the door and give it a push.
Key will not work if you ve had a new spare key cut recently it could be a poorly cut key causing the problem.
Using a phillips head screwdriver tighten all door hinges so that none is loose.
Tap the end of a chisel under the door stop on the striker side of the jamb.
Shut the door and try to lock it.
A very common problem that is associated with door knobs is that they do not latch properly.
Pry up on it until it comes loose and remove it.
Door lock doesn t latch properly when a door latch doesn t click into position it usually means the latch and the strike plate are out of alignment.
When this happens the door does not shut and opens up at any time.
You can make sure that it is the latch by looking at the strike plate and noticing if the tongue sets in the strike plate correctly.
Repairs range from making minor latch adjustments to repositioning the door.