Cheryl wrote in news:4dfc23b6$0$9980$882e7ee2
@usenet-news.net:

Do any of you know why or if the tumbler in a door knob can shift
causing it to not let the door be opened? I was just locked out and I
didn't even lock the door when I stepped outside for a few minutes. It
seemed like it was the deadbolt but I really think it is the door knob
lock. I had the locks changed a year ago by a locksmith rather then
changing out the door knobs and deadbolts.

Few possible reasons - China, Mexico, Taiwan