Just take the signs off and throw them away if you can.
If they are on the outside of a door hit it on the way in if you see a trashcan near by. If they are on the inside or you don't see a trashcan then grab it on the way out.
If the sheep don't see signs to reinforce the fear narrative and they become less afraid.
I've been doing this for the last month and most places haven't replaced them.
It's a simple act of rebellion against tyranny.
And yes, stealing is illegal but so was the American Revolution. Grow a pair and fight.
I just remind them that they don't need the signs any more. My local grocery store took down the one-way arrows on the aisles a long time ago, as everyone was ignoring the hell out of them. Walmart got rid of the 6-foot distancing marks on the floor at the checkouts a while back too. There are still signs on doors just because people are lazy. You can see yard sale signs on telephone poles from months ago. People are just lazy.
So lazy they won't replace the signs which is the point.