Talking with friends, humming a tune, and watching a movie are seen as work in everyday life because they require mental effort but do not involve physical displacement.
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Climbing a staircase involves force and displacement, meeting the scientific criteria for work, but in everyday life, work is often seen as productive tasks, not just physical exertion.
In science, work is defined as the force applied to an object causing its displacement in the direction of the force.
In the context of pushing a pebble, work is defined as the force exerted on the pebble that causes it to be displaced over a distance.
When you push a pebble lying on a surface, the pebble moves through a distance. You exert a force on the pebble, causing it to be displaced. In this situation, work is done.