Expungements are for clearing arrests[1]
> or an employer fires you for a conviction found on a third party database what are you going to do?
Ask for a copy of the report (they are required by law to provide it to you; you will know they have it because they had to get your legal consent beforehand; have to inform you decision is based on report), then dispute the report.
A company can do dishonest work and pretend their decision is not based on a report, but they can't legally use expunged records to make a decision in PA (or afaik anywhere; sealed records are another story), just because they got them from an outdated consumer reporting agency.