closing and opening of the doors during freezing conditions

Ulf, Are the doors frozen shut? If there's any moisture around the door seal when you shut the door, it will freeze shut when the temperature drops.

if you can;t lift the handle you may need to take the panels off to lube the mechanism to prevent water from getting in and freezing. if the handle works, it's prob frozen at the rubber door seals. this often happens after a car is washed, wet, etc and temps drop. if thats the case, use silicone spray or even "pam cooking spray" to prevent the water from collecting and freezing.