doors frozen

hi I have an e30-86 and i can't get my doors to open since they are frozen solid. I've tried to heat the key, pour hot water and all sorts of fluids that are supposed to melt ice in locks. Has anyone an idea of what else to do??

no but that's why I installed a remote starter in my sister's car.

Are they frozen because they are full of ice or are they frozen because the central lock controller went South for the winter? Can you unlock open the trunk, or is it also locked tight. http://www.bimmerdiy.com/e30 MAY help.