Folks. I read up on this some time back and there is some light. As Victoria does not have a Spent Convictions scheme/legislation, Commonwealth law takes precedence.
There is a Commonwealth Spent Convictions scheme which you'd be well advised to read on. In essence though, after 10 years and you have not had any conviction recorded against you, you are not legally obliged to divulge that you have a record to any person or entity. This means you can legally deny having been arrested, charged or convicted of any crime.
There are some exemptions to this though - applying for jobs that involve law enforcement, prisoner management roles you must disclose any record. I also believe that any record for sexual offences, drug trafficking and organised crime will be disclosed no matter what.
For those applying for a simple retail job or admin job you can freely and legally answer no. On the police check form it will ask you if it is for employment. Tick this it will also ask you have you been charged with an offence in the last 10 years etc....
This will present a certificate that says you have No Disclosable Outcomes - meaning either there is no record to disclose or it is spent (but it wont stipulate that it's spent)