Hy Gooberdog, welcome, the door lock only on the right hand door was supposedly a safety thing, you could push the inside door handle on the left door up or down (I can't remember) and that would lock the left door, then you could slide across the seat and exit the truck through the right hand door, now you are standing safely on the sidewalk while you get your keys out of your pocket and lock the right hand door, hope that helps.
