After ensuring that the doors are unlocked, gently push and pull the door to break the ice.
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If that doesn't work, pour warm water onto the frozen door seams. Never pour hot water onto glass, which could shatter.
For cars that are still frozen, try using a hair dryer or a chemical de-icer designed specifically for vehicles to fight the ice.
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SEE ALSO: How to dig your car out of snow
Here's what you should do when your car gets stuck in the snow