Few years ago I purchased a 2002 Chevy TrailBlazer, it did not have a keyless entry Fob with it. We have been useing the only keyed door to unlock vehical, the drivers door. No other door, hatch back or back window has a key lock. Yesterday the wife use the vehical when she started back home she unlocked door and alarm went off, she put key in and started it, alarm went off. Came home and as we have been doing hit the lock button on drivers door. Later we needed to go and when we put key in drivers door it felt like it was not engauging the lock and we could not unlock the door. Seeing how drivers door is only thing with a keyed lock, we can not get in the vehical. I am at a loss, anyone have an idea where I should look? Who can I get ahold of? Help?