[Brian Pfleuger]

Your only real chance is cooperation until you can get your hands on a weapon.

However, if you have ANY sort of security system in place then this scenario is a virtual impossibility. Even locked doors and windows will ensure that you have at least a few seconds warning. A dog will give you even more time, an alarm helps. The only way this scenario could really happen is if you have ZERO preparations in place. In which case, you won't likely have considered what to do in this scenario either.