Abandoned floor

Your school had several floors with an elevator and a basement where you had labor lessons. You didn't remember about the elevator for a long time, but on the eve of your graduation you remembered about this lesson and decided to take a ride
When you entered the elevator, something was wrong with it, there was one extra button, thinking that you hadn't had an adventure for a long time, you pressed that button and the elevator went down, it took longer than usual, a few minutes later the doors opened and you went out, in front of you was a vending machine with drinks, it was quite working, you took out some change and threw it into the machine and it gave you one bottle of lemonade, you went further and now in front of you there were three paths to the right, left and forward, you went forward and it turns out that these were corridors with classrooms where everything was pretty tidy, but why there were no lessons here is unknown, a few minutes later, while you were walking, you went into one classroom, but then outside the classroom in the corridor you heard two voices, the voice of a man and a teenager, after half an hour they moved away, you went out behind you, a man of about 30 years old was walking, you ran and breaking away from him, you ran into one of the classrooms where a guy was standing in the corner, he was tall, he stood and grinned, looking at you