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For the car they make this stuff you can spray into your lock. My
latch mechanism also froze up, this is the thing that you see on the
"edge" of the door when you open it. I hit that with WD40 and it's
fine now.

How does that help when the weatherstripping is frozen to the door? A
better suggestion is to prevent the freezing by spraying the strip with
silicone before the rains and freezing come. In that type of weather, I
don't lock the doors, nor do I use the emergency brake. Then again, I never
lock the doors anyway as it prevents damage from amateur thieves.