I just remembered... more than one recent story on the (Customer Is) "Not Always Right" consists of a hotel guest, probably in 2019 or 2020 I admit, complaining that their room wasn't cleaned, and it is discovered that they had hung out the "Do Not Disturb" sign. Which is respected absolutely, in these stories anyway.
A "Do not enter" sign as described is not the same thing, and conceivably your cleaner doesn't read English. Even if they were born speaking it.
So really you need to display the familiar graphic of two pairs of feet thought provokingly combined. :-)
Biting the hand that feeds IT
