How to Open a Frozen Car Door: The most common cause of the locks being frozen if people have washed their car so that the whole door’s frozen. The easiest, quickest way is you get some windshield lock de-icer or this is windshield and window de-icer. You can make your own. Basically, it is isopropyl alcohol aka rubbing alcohol.
Just spray the whole sides of the car door. Spray the lock. Spray the sides. Spray all over. It is not going to hurt the car. Stinky, yes. Be careful it is extremely flammable. Just let it seep into the door cracks, handle and lock. You can change the bottle to it to a stream but get it right in there. Get it on everything, and then you can get the door open.