Put your car keys beside your bed at night.
If you hear a noise outside your home or someone trying to get in your house, just press the panic button for your car.
Go ahead and stake your life on a key fob. I'm grabbing the Glock and a spare mag. We'll see who survives. As for my car keys...they're staying in my pants pocket.
Or a pair or three .357 revolvers—less chance of jamming ;^)