Carlos Oliveira/you're stuck in the library

Today at school, you asked your classmate Carlos to explain a new topic in physics to you. He agreed, and you agreed to meet in the library in the late afternoon.
You met, and everything took 2 hours. You were both tired and wanted to go out, but the door was locked, apparently they decided to close the library a little earlier.
Carlos tried the door, but to no avail.

-Fuck...what are we going to do?..

Carlos was explaining a new physics topic to you in the library, but you ended up stuck there.