Position your tube halfway extended over a table or counter top, someplace elevated the mice can get to. Set a small raisin in front of the tube. Set another small raisin at the overhanging end of the tube. If you use peanut butter you may only need a tiny bit in the tube. Place a trash can or deep bucket under the tube. Edit: you can place some padding in the bin, consider they may chew on it. While the fall is probably not pleasant it does not hurt the mice.
How it works: The mouse enjoys the first morsel outside the trap and goes for the second. When it goes in the tube, the tube will tip and fall into the trash can before the mouse can get back out. Once inside the bucket the mouse will jump so make sure it is tall enough.