Before you spawn, go all the way up to floor 28, where the elevator lets out. 
Just outside of the elevator is a generator. Move it in front of the elevator 
door. If the Survivors know what you are doing, they can move it. It requires 
three survivors to move an object. However, if you have someone else on the 
Infected side, they can go a little bit further and move the forklift in front 
of the doorway.