I know you’re kidding but the fact is these viruses are so small they are aerosolized and move around the room with the flow of ventilation. In a building they can move from room to room.
There is no practical protection from this virus or any virus of that size other than a person’s natural immune system. I don’t include these experimental vaccines because they have not been tested for long term efficacy or side effects.
I got a mask that reads ‘This mask is as useless as Justin Trudeau.’ I can’t wear it at work, however.