The model had arrived in New York City just days before in 2002. She had left her family behind in Poland and come across the world with hopes of becoming a star.

Then, she met Harvey Weinstein.

The model, Kaja Sokola, was 16, and Mr. Weinstein was a 50-year-old producer when they met at a club and he got her phone number, Ms. Sokola told a Manhattan jury Thursday.

He invited her to lunch to talk about her aspirations in movies, she recalled. Instead, he took her to his apartment in SoHo, where he forced her to masturbate him in a bathroom as he touched her.

On Thursday, more than 20 years later, Ms. Sokola recounted that day in court for the first time, at times breaking into sobs. Mr. Weinstein sat at the defense table, listening with his head resting on his hand.

After that encounter, Mr. Weinstein assaulted her several more times in the early 2000s, Ms. Sokola said. The incident that she described occurring she was a minor is too old to be the subject of criminal charges. But four years later, Ms. Sokola said, she was in New York for work and at a midday meeting with Mr. Weinstein and her older sister when he brought her to a hotel room and sexually assaulted her.

That incident is part of a criminal case against Mr. Weinstein being heard in a retrial that began last month. Mr. Weinstein is charged with committing a criminal sexual act in the first degree against Ms. Sokola, one of three women whom prosecutors say he attacked.