School isn't a literal prison either if you're advocating for sticking with the literal definition of the world.

Pedagogist here-- I don't have the time to gather a huge amount of materials in regard to this but it's worth pointing out that schools actually are designed to be, "like prisons" do to socioeconomic forces that turn schools into, "learn how to job" facilities. It's a natural consequence of neoliberal capitalism. Look into Foucault's, "Discipline and Punish."

http://www.we-aggregate.org/piece/schools-and-prisons https://sputniksteve.wordpress.com/2017/05/07/schools-prison...

(Excuse the relatively, "non-scholar" links; I'll dig into the literature at a further date. It's worth exploring.)