ALWAYS check the white board above the filing cabinets in the office to see if there are specific things that need to be done. When you do the items on the white board, wipe them off.
Some of these things can be done more than once in a day. You can run this check list more than once in a day. Just check when the store is quiet and you are not sure what else needs to be done. Please DO NOT sit your arse down behind the counter and do nothing.