HTTP/1.1 200 OK Cache-Control: no-cache, private Content-Type: text/html; charset=UTF-8 Date: Wed, 25 Nov 2020 10:42:22 GMT
He slipped a note through the door with the message "People stuck inside, please ask the property management for help," and hoped someone would pick it up and act on it.
Having said this, don't make a pest of yourself. Nobody wants to hear you ask a question every 10 minutes. If you're completely lost, make an appointment to see your teacher after class.