R.K.
I had to have my car towed to the garage I have do all my repairs, once. After a night in a heated garage it was all thawed out, but it was not cheep. If this happens get in whatever door you can open. Hopefully if you drive it and warm it up the doors will thaw. Once you are able to open the doors rub the rubber gasket with vegetable oil. The water can't stick to the gasket thus it can't freeze.
If driving around doesn't thaw it out wait a few days when the weather warms up and then use the vegetable oil.
ETA:
Many mechanics say to never use WD-40 or Vaseline because they are a petroleum product and can damage the rubber gasket. Vegetable oil will not damage the rubber.