Apparently the cold has made it impossible for you to type, or to think of a descriptive title??
You can very easily lock the keys in the car. You have two options. Keep trying with a coat hanger or something, or give the dealer your VIN and provide proof of ownership and have them cut you a new key. The car will probably run out of gas before that happens, so I suggest also picking up a gas can to fill it up.
Why don't you have a spare key?