I had an unpleasant experience in my Armada this Saturday. I parked the truck in a mall, when I tried to open the driver's door from the inside the door would not open. I tried the automatic locks and tried to push the door hard and nothing. Out of frustration I yelled to my 15 year old son to open the damn door from the outside. He pointed out that the door latch was stucked in the open position; apparently when I opened the door to get inside the vehicle the last time it stayed like that. As a result, it got stuck and did not want to open. That was really disturbing because in case of an accident I would probably be dead meat! I will try to use W240 oil or something. I checked it and it has factory grease. Should I take it to the dealer or has anyone experienced that?