SAN FRANCISCO — U.S. District Judge William Alsup isn’t ready to accept Apple’s argument that its employees choose to submit to the company’s security screenings and therefore can’t demand wages for time spent waiting in line and undergoing searches.

“The summary judgment record is at best ambiguous about whether the security screenings were mandatory for at least some locations and circumstances,” Alsup wrote in an order Friday denying Apple’s motion for summary judgment in Frlekin v. Apple, 13-3451.