A key.
Not only a key, but a key that works specifically with your car.
No. The wiring is inside the cab.
Can you not unlock your door with the key and then pull your inside release etc. ?
There are many things that can cause this. Take it to a garage.
You would need to pry the door panel off and then play with the door lock and handle rods from the inside.
Try to some how remove the door panel. And unlock it from the inside out
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It only uses ( 1 ) key , unless a lock cylinder has been changed