Pretty sure I do know how to use a shotgun, also don’t live
In a trailer. And if you are worried about that, you can load your shotgun with less-lethal rounds that won’t penetrate. *Any* centerfire major caliber cartridge will go through a trailer wall, even .380.
If you feel racking your firearm is required because the situation is life-threatening, you should be opening fire and using the element of surprise not performing threat displays.
The racking was your warning