The inside is a small room with just another door on the other end. Looks like it's locked by some kind of card-swipe machine. But...about when Natalie pokes her head inside, someone opens the door from the inside!
Said person strongly resembles what you might call a "Were-
furfrou", with thick white fur under his clothes and some especially poofy hair. "Ahh, 'scusez moi," he says in French, holding the door open for her politely. Seems like he's just assumed she's supposed to be here, card for swiping the machine or not.