2003 Other Opel Models Hand Brake Stuck on

Hi there, tried to start the car after heavy frost the night before, -7 deg, on thursday morning, car pulls when trying to reverse from drive and wont move, handbrake down but feels like brake is stuck on. Won't move forward either in first. Caould it be frost or another issue. If it is frost, it's saturday now and I tried this morning and it's still stuck on, surely it wuld be thawed out by now? If it's a mechanics job, what would be the cost, thanks for your help ;-)