Lift, by Minh Le and Dan Santat
"Big sister Iris lives in an apartment building with her parents and little brother, who is only a toddler. Her responsibility in the family is to push the elevator button when they go out. She can always count on the incomparable power of pushing the elevator button to bring her joy when she is feeling down. So, when her little brother usurps her button-pushing duties—to the delight of her parents—Iris feels utterly let down. But she becomes hopeful when she notices the elevator repairman throwing the old elevator button in the trash. Iris quickly grabs the button and takes it home, where she secretly puts it to magical use. After a while, Iris finds an even more uplifting way to enjoy amazing elevator-button adventures. Lift underscores how our own acts of generosity can elevate our life experiences"