First of all, you're not barred. Only certain offences result in being barred, and they're all safeguarding offences. However, that doesn't stop employers discriminating against people with convictions to disclose. To counter this, in Scotland you have the right to appeal to the Sheriff's Court to have the conviction removed from your PVG. You can find details here
. Your conviction should be spent by now, and it doesn't appear to be on the list of offences that must be disclosed, so that's encouraging.
As Chris Stacey said: Although its not formally part of the sentence that is handed down in court, the criminal record that someone comes away with effectively becomes a second sentence, which can have a long-lasting, if not lifelong, impact.