I was almost killed by police years ago. I worked for a it company who was contracted to a credit union to basically be their it department. They were opening a new branch. I was there doing the final preparations as the grand opening was the next morning. Everything was done, I told the vp/cto/cfo who was my main contact that I would be back the next day but everything should be set so I was calling it a day. I had a notebook with passwords, ip addresses, etc. Which I left behind by accident. I walked out the door and there was 6 cop cars in a semi circle, cops behind their car doors, guns pointed at me, screaming "get down with your hands above your head". I'm not a fool so I got on the ground. Luckily the vp saw I left my notebook and walked out to give it to me before I drove off. He walked out and got same screaming. He basically gave them his name and titles and we were brought into the building and found the CEO.
Turns out they installed a security system and the security company tested the system to ensure it was working. They forgot to inform the cops that it was a test. The best part was I was there when the cops gave essentially a ticket for false report to the ceo, I forget the cost but it was in the tens of thousands. The ceo took the ticket "thank you officer" and without missing a beat just turned to the guy from the security company "and this is for you". No question, no negotiation, just like you fucked up and I'm not covering it.
A guy who wants to creep is not going to be stopped by a sign.
Maybe he will sit at a table and track who goes in and out of women's room and wait till there is no one in there, to go to "the wrong door by accident" and hide in stall.
A sign won't stop them. Punishment will...if you experience that report it. Get them arrested. If they try to make it physical punch scream kick scratch.
Its like locking your car doors. A car thief is likely to just break the window. Or just steal your catalytic converter.
It makes you feel safe but doesn't prevent crime.