Truck Forums - Stuck door lock

I recently replaced the door locks (where the key goes in) and the exterior door handles on my truck. Everything worked fine when I tested it. Now I go back a month later after the truck has been sitting with the door unlocked since it was in my garage. I pulled the truck out to work on my car and parked the truck outside and locked both doors. I came back about an hour later and tried to unlock the door on the passenger side.... and it wouldn't open with the key or by pulling the inside knob up. What happened, and what can I do to get the door opened? Thanks.