I prefer to think it reads “Man, please bring back the key” as if the employee who scribbled it down was about to hit the despair event horizon because of all the men’s room keys that were never brought back. As it is, I guess it’s just an artifact of having a staff roster without a single native English-speaker on it. It also kind of boggles my mind that there exists a Subway with locked bathrooms. I figured that was just a gas station thing, but I guess when you’re downtown, anything goes.
Alternatively: Bs aren’t that hard. I’d hate to see this person try to deal with a Q.