Don't release what you can't put back

Housed inside a vault in the basement of an abandoned school lurks an evil that has been locked away for over a hundred years. When a teacher and 5 students visit the school to archive any memorabilia before it's torn down, they mistakenly free the horrific spirit, turning the school into a deadly prison. Now they must face the evil and banish it to the vault once again before it kills them and escapes to destroy the world...