Benjamin looked at the closed door, but turned his back to it so he could face Artemis. "I'm not much of a lockpick, so getting a key would be best. I reckon there would be one in the nurse's office, but to get that..." he shook his head. "By the time we find it they will have noticed we are there. But... maybe the janitor or the cleaning staff could have the key. And maybe the psychiatrist will have one too. That office is empty during the night, but might be locked as well." 

He started walking, gesturing Artemis to follow him. They had spend enough time standing near a door they weren't supposed to be, he didn't want to be found by any of the staff.