Extend the Story - Add a Room

You drop and re-open the Briefcase where you realise the gun you have is a Sniper Rifle. If you ever get out of this situation, you think, you will get another gun for close range combat. you pull the Sniper out, aim it at the door and pull the trigger before you realise you don't know what your doing and, wouldn't you know. The gun did nothing.
You look at the door again, and realise 2 more locks are broken. 1 more lock and they will be in your apartment.
What are you going to do now?

You look in the Briefcase for instructions