sounds like the lock actuator is bad. It is a vaccum or electrical with a metal shaft attached to the lock mechanism. The problem could be a bad electrical connection. the to repair it remove the door panel carefully, find the metal shaft and check to see if the problem is there. The get the door open problem would be like the keys were locked in the car. if you or someone you know can do it, fine. If not some tow services can do it, or call a lock smith. hope it helps. duboff