Our office hours to receive assistance with your jury service are Monday through Friday from a.m. You will be required to make only one appearance in court for jury selections held that day, or serve for one trial (jury selection may take more than one day).I have been registered to vote for 10 years now (which is what makes you eligible to be called), but I have never received a summons to jury duty. The portal will provide the time. You'll go to the second floor of the courthouse, they'll take the paper slip you got and then you wait. United States District Court Jury Office 280 South 1st Street, 2nd Floor San Jose, CA 95113. Phone: 408-535-5393. The Criminal Grand Jury is impaneled for three-month terms and is selected at random from the list of trial jurors in civil and criminal cases. What happens if you don't show up for jury duty when you were selected for trial? Jury cases are either criminal or civil.