The single drivers door lock is known to get sticky. If you have not used it in the last year, there is a good chance that the lock will be either very stiff and hard to turn or that it will not turn at all.
You will need to lubricate the lock. If the lock is really stuck, then a dry lube may not be enough to break it loose. Lock-Ease is a nice messy lube (graphite + solvent) in a can that can usually get any non damaged lock unstuck.
I like the lock ease spray can with the little stick. Use the stick and spray some into the lock. Then spray a little bit carefully onto both sides of the key. Curse and clean the mess that you just made. (lol) Insert and remove the key four times.
Spray a little bit more into the keyhole of the lock. Put a small amount of both sides of the key. Put the key in. Try to turn the key both directions. Remove key, Put in the key. Try to turn the key in both directions. Add small amounts of lube to lock and to key as needed.
Eventually you should get the lock to turn nice and smooth. A quick easy fix is perhaps two minutes. A stubborn lock is perhaps five minutes.
Reminder: lube and test your Touareg door lock with key lube twice a year. Otherwise, the %$%$ drivers door lock will not work when you actually need it.
