Break the glass of the sunroof to enter the car.
Try to pry open the sunroof.
You steady yourself onto the roof of the car, and you hear the roof creak below you. You start to walk towards the sunroof slowly, trying to make the least noise as possible. You look up and see that the creatures have noticed you and have turned your way. You pick up your pace, knowing that they have already noticed you, and the creatures start to bolt towards the car. The creatures are far away but are getting close fast. It was too late to go back, so you inspect the sunroof to see what you can do to open it.