Which books feature ETs trapping humanity in a time loop?

All You Need Is Kill by Hiroshi Sakurazaka

If you dare look at Doctor Who books, there’s probably at least one in there.

Doctor Who itself is some sort of time vortex where aliens of a thousand types all mess with Earth throughout many points in time, often in the same plot thread.

Even not counting The Doctor, who is himself an ET messing with the timeline on Earth (or of Earthlings he whisks away) over and over and over and over . . .

To Your Scattered Bodies Go and the fabulous river boat by Phillip Jose Farmer. Also known as the river world series.

Not a novel but “The endless” is a film about this.