If you wish to speak to a clerk in the Jury department, you may call (312) 435-5684 from p.m. To be eligible for jury service, you must be a citizen of the United States; at least 18 years old; a resident of the county; not have a pending lawsuit.Discuss each charge or claim, one at a time. • Vote on each charge or claim. Get there a little earlier if you can, have to go through the metal detector and fill out a questionnaire. This handbook is written to help you understand your duties as a grand juror, with some practical suggestions to assist you in carrying out those duties. You can ask to be excused for "undue hardship. " Whether you will be excused is up to your local county board, jury commission, or jury administrator. Sheriff's officials say scammers call residents and tell them they missed jury duty and could be arrested. Residents are advised to report suspicious calls.