Well if they mis-identified themselves as police, that in itself is a crime, whether or not he agreed. Further, if anyone in the DA's office actually cared[1], there would be a decent case for criminal trespass since the guy did not let in Apple employees, but police officers in his mind... further a creative DA could probably even try for fraud if anything was damaged or property was lost since it was under false pretenses.
[1] Nothing will come of this... gotta protect the nice big corporations even if they occasionally get it wrong. That guy was surely a common fellow, pure worthless evil most likely, otherwise Apple would not have suspected him. This is good enough for any DA to ignore the law that might otherwise protect that common trash.
Consider that the actual police were there at all. They probably didn't each go on their own initiative. Apple's guy called an SFPD guy, who arranged for the officers to go along. So someone in the SFPD hierarchy was in on it.
No one in the SFPD is going to testify, or state during an investigation, that the Apple corporate police said anything that would lead the victim to believe that Apple's people were real police. Even though that was the whole point of the officers to be along, so the words "San Francisco Police" could be spoken, with all implications that come along with that.
[1] Nothing will come of this... gotta protect the nice big corporations even if they occasionally get it wrong. That guy was surely a common fellow, pure worthless evil most likely, otherwise Apple would not have suspected him. This is good enough for any DA to ignore the law that might otherwise protect that common trash.