Question

how to use a classroom as a personification

Answer 1

Well, Personification is giving a human quality and or trait to an object that is inanimate. An example of personification and more information can be found at this link:

http://lifestyle.iloveindia.com/lounge/personification-examples-2848.html

Answer 2

Well, personification is the attribution of a personal nature or human characteristics to something nonhuman, or the representation of an abstract quality in human form. So, you can say " The classroom wished that the janitor came and cleaned its floors"