strange door and keypad in cantermore library

[Static Mental State]

so i recently found a hallway in cantermore library, so i went inside and found this strange door at the end of the hallway


and one of the notes has a combination, and that the keypad was behind the desk...so i went to black ink's desk and i found this keypad

however when i clicked on the keypad, nothing happened, i tried over and over, but still nothing. anyone know what this is? i wanna know!

edit: i don't know how to add images, i tried but it didn't work...