Just bought a '99 yesterday and the door locks don't work. The automatic unlock button sometimes works and other times it doesn't. Also was not provided a key to open the truck from the outside. Never had this problem and am clueless as to what I need to do. I took off the door panel and unlocked it yesterday, but now I need a key. Is there a way (inexpensive) to replace the locks? maybe I'll use a masterlock on the outside....