If you are a truely prepared family, this will all be redundant anyways, because your house is always locked and you always have your gun at hand.
When the weather is nice and there's no specific threat, we often leave the windows and back door open. We will often leave the front door open as well, although this requires an adult to be within line of sight of the door. We're by far the hardest target in our neighborhood, and if there's a reason to we harden up some more.