so my apartment building has 3 exits - 1 is the main front entrance in the lobby, and 2 are side exits through the stairwell (there are doors leading from the building hallways into the stairwell, and then a second door leading from the stairwell to outside)

yesterday, in an effort to "deter homeless people from entering the building," our building manager made it so the interior doors that lead to the stairwells (and by extension, to the side exits) are now locked from the inside and require a physical key to exit, leaving us with only the single main entrance to the building unlocked

my questions are

1. are the interior doors leading to the exits allowed to be locked? i confess my own motivation is that it's a pain to bring a key with me when i take my dog out, but it also seems problematic as a fire in our front lobby would leave residents with no other unlocked exits
2. is the building required to put up a sign indicating that the doors are locked all day? it's been less than 24 hours and half a dozen people have been stranded downstairs because they didn't realize the door would be locked

thanks!

ps. no, i don't have an answer as to how locking these interior doors, which you can't even get to without knowing the front door code, is supposed to prevent people from entering the building