Three weeks ago the key fob worked fine just before I left on vacation. Came back to find that both key fobs no longer unlock/lock the doors although the little red light flashes each time I press the buttons. I tried the mechanical key and it doesn't unlock the driver side door either. I've tried turning it to the left and right to no avail. I left the car's manual inside the car so I can't find other ways to "fix" this problem. Do guys know what is the problem here? Dead batteries in both key fobs but I don't understand why the mechanical key cannot unlock the door...?