Front Door
The door a criminal will get into is the front door. Now hold on, you may be thinking, wouldn't they go for the back door? No! 99% of home invasions happen when you leave your own front door unlocked!
You better check the locks on your front door right now, because odds are you left it open and didn't even notice. It's the perfect door for a criminal to get access to your home.
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To protect your front door from criminals you plan to fill it with heat (ひ). Oh yeah, we're gonna Kevin McCallister this.
Imagine how you'd heat up your front door. A hot iron? A blow torch? A small fire? It doesn't matter how, as long as the heat makes it all the way through your front door and hurts any criminals trying to get into it.