Work won't let you take off
Wow! I am very surprised at how your boss is acting. This isn't right! You shouldn't be forced to work when there is clearly a risk at hand. I can't seem to come up with a solution to this problem, but it's just wrong.
Maybe can you try calling your Mayor's office? Most towns are on some sort of a shut down schedule, shorter working hours or something. Call your unemployment office too, just to see where they stand on you being able to file a claim if you end up quitting or getting fired. Since the game plan these days is to be socially distanting...
I can understand that he needs you - someone - to fill the position, but in fairness, you should have a right to refuse due to the circumstances. Put an ad in the local newspaper, the "Your Opinion" column or where ever it can get noticed. For that matter, just tell this story to a newspaper editor or your local TV news and the answer may come to be the talk of the town.
This is a tough one for you, I wish you the best of luck. Sorry I can't really help!-