2002 2500HD Crew Cab doors intermittently won't open

[MadManAndrew]

Occasionaly, the door locks on my truck will refuse to budge, and it turn, the doors cannot be opened. Most of the time, it is my passenger door lock on cold mornings. When you push unlock on the key fob or switch panel, it will barely move and then return to fully locked, and if you try to unlock it manually, the actuator will not move. You just pull on the linkage and when you let go, the indicator will return to the locked position. This morning, my driver's door decided to do the same thing. Luckily for me, my passenger door lock was working properly today and I was able to crawl over and get out. I thought nothing about it before because my passenger door lock is weak even when it does work, but this is becoming a serious problem with my driver's door not opening this morning either. Any help would be greatly appreciated, I really do not want to be stuck in my truck.

Thanks, Andrew.