Here are some useful tips to unlock frozen or jammed lock:-
Try to get inside the car,
Use a de-icer,
Melt the lock.,
Chip away the ice,
Use windshield washer fluid,
Heat up the door
Try to get inside the car,
Use a de-icer,
Melt the lock.,
Chip away the ice,
Use windshield washer fluid,
Heat up the door