Screwed,can not work on car.

Depends, doesn't it? Is the garage separate? Is any of the family wandering out there to the garage for any reason? And nobody knows if this "6 ft" thing is actually effective, or just some number that some expert dreamed up.

Personally I don't think the 6 foot thing means squat.
What if there is a breeze and an infected neighbor sneezes or coughs up wind from you?