You indiscriminately smash the door with your foot, wasting all of your energy in one concentrated smack. The door gives way a little, but stops short of fully opening. However, you did manage to open it just a little. Your reward is a single, lonely ray of orange sunlight. The sun is rising.
You put your foot down, and feel a searing pain in your ankle. You can probably limp out of the room if you manage to get the door open.