Why does it seem so hard

I admit, when I was a kid and my mom always wanted me to clean up, I never realized why it bothered her so much. She could just close the door and hide my mess, for years we argued about this and I always thought it was such a petty thing....well lets just say that now I have kids and I have payback x2. Why is it so hard to get a 5 yr old to clean up after herself. She can come up with every excuse in the book and I look at her and wonder where in the world did she get that one from. Then I clean up and turn around and I think that a tornado has just touched down in the exact spot that I just cleaned and destroyed everything I did...not only that but somehow it seemed to also add to the never ending laundry and dish pile on top of everything else. I think us moms need some special energy juice just to keep up with the kids, house, meals, school, etc. Before I had kids, I never thought that it could be this hard. Don't get me wrong, I love my kids to pieces and I enjoy them, but I wish they came with a clean up button already installed....