I would have thought that outfits such as Briscoes etc would have the hours of work starting before the shop opens and after it closed such as 8:45 to 5:15 for a 9-5 opening time for example.
In any "retail" outlet you cannot just down tools so to speak and leave at 5pm. need to cash up each day and get it out in the morning as a minimum, doesn't happen instantly.