The Lock Doesn’t Locking And Unlock Smoothly.
To begin troubleshooting your lock operation, check to see if the lock operates smoothly with the door open. If it does, the problem is not with your lock, but rather in the alignment of the door and frame.
You can also check the door and frame for twists and warps. You should see the door completely rest against the door stop and stay there. Furthermore, If you have weatherstrip on the door, it could be obstructing the path of the door. Keep in mind, wooden doors and frames will warp and swell with temperature and humidity, and metal doors and frames will twist and rust with age.