Convincing Democratic Rep. Barbara Lee to be the star of a documentary was almost as much of a challenge as getting an infrastructure bill hashed out in D.C. But Oakland filmmaker Abby Ginzberg specializes in persistence and persuasion, and doesn’t mind being a pest when it’s warranted. Ginzberg’s determination pays off with “Barbara Lee: Speaking Truth to Power,” an engaging and inspiring documentary that provides insight into the politician, the person and the role model. It opens Friday at the Shattuck in Berkeley and the Roxie in San Francisco, and will also be available that same day on demand. Lee is slated to attend the Aug. 26 screening at the Roxie.