Hard simple riddles with simple answers

What goes up and doesn’t come back down?

Poke your fingers in my eyes and I will open wide my jaws. Linen cloth, quills, or paper, I will devour them all. What am I?

What am I?

I have keys but no locks. I have a space but no room. You can enter, but can't go outside. What am I?

There is something which arrested for attempting but not for completing. What is it?

Thousands lay up gold within this house, but no man made it. Spears past counting guard this house, but no man wards it.