Do you have any targets which require you to meet certain standards?
In your current role, do you have any targets which require you to meet certain standards? Things like accuracy on the till, customer satisfaction scores i.e. mystery shopping, sales revenue generated, store card sign-ups - that sort of thing? If so, then you have real experience of working towards targets.
Don't be too blinded by the term 'KPI' either. I've heard many different descriptions for the same thing over the years such as SLAs, KPAs, KPIs, EBRs.
Give me a shout if you want any help.