I have a compost pile on the ground that's full of worms. I don't turn the pile I just keep adding more stuff to it. If I need some worm compost I just come in from one of the sides, flip it up and take from the bottom which is all composted. Most of the worms are higher up in the pile where all the newer food scraps are.
The problem is other critters get into it which is fine for outdoor use but to get a product that I can mix with soil I might use indoors I'm going to start doing in-bed vermicomposting where you cut the bottom out of a buckets, drill large holes in the sides, and bury them in the ground with a lid on top. That way no flies or other bugs can get in as the only access is going to be from the ground.