I couldnt lock myself out of my 66 if i tried, and i dont even have a door key. Lol. When either door is locked then shut, they unlock. What i do reach over lock the pass door, get out d/s with the window up, reach in the vent window, push handle down the lock driver door. Close vent window. Yea the vent window is not locked, but i dont think many around here know how to gain access through a vent window, let alone drive it. Maybe 1 day, ill get a lock and key for it
