I went to a private high school, and I was one of the select few allowed a key to the elevator for some boring health blah, blah, blah.
Like most elevators, this one had an emergency phone.
Unlike most elevators, this one's phone was listed in the phone book.
So it wasn't uncommon for me to answer the phone and chat with some poor parent looking for information on admissions. Fortunately for them, I worked part-time in the admissions office and could direct them to the right number. Unfortunately, I graduated some years ago and am no longer available for that service...
(True: You know the kind of luck I have? The kind where I drop the key to the elevator down the elevator shaft. Luckily, I knew rescuing-type people.)