Juries Act 1981, ss 15, 32
If you are selected for jury service, you have to serve unless:
you belong to a category of people who are disqualified from jury service, or
the court excuses you from jury service or allows you to put it off until a later date.
If you have not been deferred or excused from jury service, you can be fined up to $1,000 for not attending.