Just found out how to lock the doors when the key FOB is inside. I go fishing a lot and due not like have the key FOB on me. If it gets wet it's all over. I separated the key from the FOB and auto locked with the FOB in the cab, but the doors soon unlock on their own. I tried the same but used the switch on the door panel and the same thing happened. Then I just manually locked the doors by way of the button at the window and it stayed locked. Did not find anything in the owner manual about his procedure.