One Cut of the Dead (Japan, 2017)
What happens if you're filming a zombie movie when a zombie apocalypse breaks out? One Cut of the Dead attempts to answer that question. Said apocalypse happens in real time without cuts or edits. It's a technical achievement on par with Alfred Hitchcock's Rope, but with zombies.
One Cut of the Dead is also clearly inspired by Charlie Brooker's Dead Set, where the cast of a Big Brother reality show are locked inside of the Big Brother house when a zombie apocalypse breaks out.