Unfortunately with the Covid pandemic a lot of shops have been temporarily discontinued. The only thing you can do is look just a little outside of your normal geographical zone to see if there are any available. I have found ISS to be one of the best programs to be with. But that is not to say that there are not others out there that may have jobs in your area, or even telephone shops. You will just have to look around a bit.
As Dorothy and Michele said, start out small. Getting into "undercover" mode is something that takes some time. Start with simple shops to get a feel for the job. As you progress you will start to feel more comfortable in your chosen role. Many shoppers like to stick with only one or two types of shops. This is O.K. in the beginning, but you need to move out into other roles. With the Covid thing there are not that many jobs out there right now so you need to become more diverse.
Just take your time and enjoy!