I have a poster that says what to do at the end of the day (pack-up, pick up the floor, straighten your desk, etc...). You could add in "jobs" for the students who do have it. How long do the jobs take?
I give out a piece of candy at the end of the day for anyone who didn't clip down (we use the clip chart method for discipline). I won't give out the candy until everyone is finished and the floor is clean, etc... It really motivates them.
They get their candy, then everyone sits quietly in their desks while I do a read aloud. I always do books a little above their reading level so it's not something they would pick up themselves. It's a very quiet ending to the day. I just read until the bell rings - then I put a sticky note where I stopped since it's rarely at a good stopping place.
I plan to do the same thing this year - it's worked well for a few years now. I teach 3rd, but I'd do the same thing with 2nd.