You try your hardest but ironically you cannot get hard due to the walking corpses outside and the fact that your pants are still wet.
grab something and throw it at them
You pick up the closest thing to you which happens to be your coffee machine. You huck it at the door in the hope it would break thought the glass.
Apparently not. You pick up the microwave that the coffee machine was on top of. Suddenly you hear glass breaking.
Uh oh...