My car's door key hole doesnt work?

I have a 97 Jetta, it's got power doors but recently the driver's door stopped working... From the inside of the car I am able to lock and unlock all doors including the driver's door just by pressing the lock/unlock switch... I know it's not the motor to the door because if it were, it wouldn't work at all. The problem that I have is that I'm not able to open the door from the outside with the key. I have to use the passenger side door to unlock the doors.. If you own a Jetta you will know that to unlock all doors you have to turn the key towards the front side of the car twice. If I unlock the doors with the key from the outside from the passenger side it will open the dirvers door.. For some reason the drivers side key hole wont work. It just all of a sudden stopped working one night... I also know that no one stuck anyting into it because the key goes in freely and turns without a problem. Before it stopped working when I would insert the key and turn it, it was have some resistance to it, (felt like it was actually doing something) and now that its not worknig I dont feel any resistance when I turn it (feels like its not turning anything). When I close the door I dont hear that there is any loose objects in the door either. I dont know maybe there is something at the key hole that broke or a small motor that turns the larger motor? I really dont know much about this.