In your sentence, it would commonly be phrased breaking curfew:
"A constable doing his rounds as the night watch came across a man breaking curfew. He was detained until the following morning."
"Life under curfew for American teens: ‘it’s insane, no other country does this’":
Since the 1990s, millions of teenagers have been arrested for breaking curfew, which a policy analysis shows has a disproportionate impact on minorities
"How should we discipline our teen for breaking curfew?":
How should we discipline our teen for breaking curfew? I don't want to be too harsh, especially if he's only a few minutes late, but I do want him to take the curfew seriously.
"Pakistan’s Akmal fined part of match fee for breaking curfew":
Pakistan middle order batsman Umar Akmal has been fined 20% of his match fee for breaking a team curfew ahead of the fifth and final one-day international against Australia on Sunday.
Children and teenagers that break curfew are taken to the local police station and police officers inform their parents to get them. The age limits stated here shall be based upon year of birth, not date of birth. If a parent cannot be reached, the child or teenager is taken to a shelter.
It also turns out that the initial hits for the term on Google are related to the album from Red Rider titled Breaking Curfew, which is suggestive of its popular phrasing.