What has been bugging me about this is the unanswered questions. If the wires have been damaged, that could likely be it. But if damaged wires are not the cause, I would ask:
Did the OP buy the car new? A new car comes with 3 fobs/keys, did none of the keys unlock the door?
If the OP bought the car used, did it come with 3 fobs? Did none of those keys unlock the door?