Only thing I can think of is :עובדים=workers (not permitted)הנהלה=management (permitted)Mark
obviously, but it is still a funny way to write it. no entry to anyone, not even employees. just funny.
also a little rough if the mgmt has to hang up a sign for their employees - after all it isn't a school with 100s of students. just tell everyone nicely a few times and the grownups will catch on.(this is a photo from the new store in RBS, Raffi?)