The Hop Pickers (1964)

This Czech musical deals with adolescent morality and bureaucracy without being heavy handed. Under school supervision, a group of pre-teen boys and girls are busy picking hops. One boy who seeks privacy builds a secret hideaway in an attic. When a schoolgirl finds him in his retreat, innocent puppy-love blossoms, but a jealous classmate tells the teacher about the two friends, and they are suspended from school. The boy and girl accept their punishment and form an even stronger bond. The two leave the school together while their classmates ostracize the jealous informant.
~ Dan Pavlides, All Movie Guide