Six years before Buffy the show (and one year before Buffy the not so great movie) there was Hiruko the Goblin, which tackled a premise about a portal to hell opening up underneath a school before either. Granted, beyond that it's not super comparable, but maybe a tiny bit interesting either way.
Hiruko isn't a masterpiece but it was very enjoyable. It hit the spot on a Friday night, being a pretty straightforward movie about a couple of guys trying to prevent demons from hell from entering the world. It takes a few detours and has some flashbacks, but it's interesting that the film mostly focuses on two main characters, whereas you'd probably expect this kind of movie to have a bigger group of main characters.
Still, it works, and while they're not complex or find themselves standing in the way of the special effects and bloody yet often comedic violence, you do care enough about the two leads. There's even some emotional stuff towards the end of movie that kind of works; feels a bit jarring, but it adds another layer to things.