The film acts as a "fear circle" or a dreamlike state where the barrier between life and death dissolves.
Some horror stories use the concept of a "doorway" to silence as a metaphor for being overwhelmed by a silent, menacing force.
Door Into Silence - We Are Cursed to Live in Interesting Times
The film ends with a profound quote: "...When you go to the gates of nothingness, no one will be near you: only the shadow of your death ... Book Four of the Apocalypse". Key Themes
(people realizing they are already dead)? The Christian meditation approach (John Main)?
After leaving the cemetery, Melvin is haunted by a mysterious hearse that repeatedly appears on the road, trying to run him off the road. He is also shadowed by a beautiful, enigmatic woman in a white car.
Door to Silence by John Main is a book of short quotes and reflections on Christian meditation, mindfulness, and peace.