Anne Hendricks in "Good Luck Miss Wyckoff" if you search for Teacher or Teacher Janitor on videos here you will see a few clips. You can search for it online and see the whole movie. First forty minutes are boring. But then it gets good.

Miss W. Is sexually frustrated liberal white women who teaches latin in kansas . ray the janitor is a black football player who has to clean the classrooms so he can make some money. he develops an interest in Miss W. Rapes her in her classroom . Then he seduces her next, humiliates her and finally almost burns her. Some good , tough scenes . Didn't like how it ended but it has some good scenes in it.

That powerful scene is so hot and memorable.