So it's a Buffy plot filtered through a Lifetime movie...

...with a fingernail-on-chalkboard soundtrack. The only slightly interesting part was the last 41 seconds.

As for the titular door: if they really want to prevent a cataclysmic breakdown between metaphysical realms, put a dead bolt on the damn thing! Get it, dead bolt. Cuz this movie was pretty lifeless. For a Lifetime movie with a Buffy plot and shrill sound design.

It's also Hindu Pet Sematary.