Escape Games - High School Adv

Assume that you are a teacher working at this high school. You were preparing for your class the next day in the staff room but the janitor locked the school and went assuming that no one is in the school. Now, you are stuck inside the school and you need the key to escape. There will be a spare key in the school and you must find where it is kept. Find the key with the help of clues and hints and escape from the high school. Have fun!