For Christian Pellot, most weeks begin the same way, with a text from an unfamiliar number telling him to show up at a specific address. When he arrives, he is told to sign a wage form, with the hours and pay rate to be filled in at a later date. Then his work begins, sitting for days and nights in a parked vehicle to save street spots for any one of the scores of television, movie and commercial productions filmed around New York each year.

In a class-action complaint filed this week, Mr. Pellot and more than 100 other parking production assistants — almost all of them black or Hispanic — charged that several major studios and production companies that do business in the greater New York area systematically underpay these workers, deny them minimum wage and overtime pay to which they are legally entitled, forge time sheets, and threaten to withhold future jobs if they do not comply.

At a news conference outside the now-closed Ziegfeld Theater, several plaintiffs gathered on Wednesday to describe their experiences working on movies like “Trainwreck,” “American Hustle” and “The Amazing Spider-Man.”

“Without us, there are no movies and no shows, and yet we’re still overlooked and underpaid,” said Mr. Pellot, 43, a single father of two daughters from East New York, Brooklyn, who said he had worked as many as 150 hours a week on productions like “The Wolf of Wall Street.” “All we want is our fair share.”