I remember once being bothered by leaves on new grass. Here is what I did. I placed bricks at intervals and set a board across the bricks...I weighed a lot less at the time.
I walked along the board and picked up the leaves. Most of the grass was not harmed by the process and the small spaces where the bricks had been placed recovered quickly.
Forgot to say, this is a good activity for middle-sized children who will work for cookies and/or ice cream. They can actually make a game of it.