My lock (or handle lever) seems to be sticking, and doesn't turn easily with my key, how do I fix it?
Check to make sure the 'snub nose' that is used to hold the door open, has been moved back to its proper position for closing the door. If left out of position even slightly, it will keep the door from closing properly and require you to pull the door closed. This creates a pressure on the door lock against the door jamb, as the door tries to open. If the 'snub nose' is not the problem, then simply lubricate the lock (or handle lever) with WD40 and wipe off the excess. Sometimes, spraying your key and inserting it into the lock several times will also lubricate the interior mechanism.