Manager asking me to do work without getting paid.

Hello everyone,

I have been working at a fast food store for about 6 years. Worked my way up to becoming a shift manager.

Due to some good fortune, I got a regular 9-5 job.

Now I work there Saturday and sunday. We recently got a new store manager after the previous one left. The new manager feels threatened that i have been in the store for way longer and gives me unfair KPIs and letting me know when I cant achieve them. She has been give me less and less hours every week.

She now wants me to come in on the days she hasn't roastered me to do inventory and order stock.

The shop owner doesn't want to get included as she says that i only work 2 days. What should I do as I don't want to leave the job.

Thanks