Computerised keys

Frozen Car Door:
You can prevent your door from freezing shut by spraying the door frame with spray cooking lubricant like Pam.
If you have not treated the doors and find them frozen shut, try these steps to unfreeze them.
First, try all of the doors (including the hatch) to find the one least frozen. Do not try to force a frozen door open. This can damage the seal around the door.
Next, while wearing gloves, hit the ice with the palms of your hands, and remove the ice as it breaks.
If this method does not work, you can use a hair dryer to melt the ice.