Does it mean that men are allowed “only beyond this point,” restricting their movement?
Or does it mean that “men only” are allowed beyond this point, restricting the movement of oh, say, women? Given that it’s at the entry to a men’s changing room, I expect that is the meaning. That meaning might better be rendered as “Only men beyond this point.”
Or, perhaps, “No women or girls are allowed in this men’s changing room.”
Oh, if only only weren’t so pesky.