Just curious: If your door lock is frozen, do you schedule an appointment with the dealership?
Come on, this seems like a simple thing to me. I must be missing the real crux of the issue. So what if it is frozen. How often do you have to adjust your mirrors anyway?
If your windshield wipers are frozen in the morning do you call the dealership and complain?
Now help me understand the real problem with some freezing. Heck, you are from Canada of all places. You should be used to some freezing issues. Help, please... Help.
Oh, should I suggest De-Icer.