1997 Volkswagen Jetta power door locks

When did you last replace the battery in your key/door lock activator? I'd start there since you've covered the other bases. You can't lock the car from outside? Well, how about locking the other three doors from the inside and then using your key to lock the driver's door once you're outside? Reverse is how you get in. Temporarily. Been there and had to do it with my '03 Jetta. Hope this helps!
Tom