1997 Mitsubishi Magna Car door

Hello, I have a Mitsubishi magna, and someone backed into my drivers door and dinted it, and breaking the window. After that the door didn't close without fully slamming it close, but it would open still. Couple days later the door wouldn't open from inside or out. How do I somehow open the door to replace the whole door? Please help, I have no window and being winter is absolutely freezing! Also a hassle to get in and out of the car, and hoping nobody steals the car while I'm out. Desperately need advice please! Thanks