With the invention of cell phones and porting it is quite common not to have a phone number that is not in the same number. I find this not to be useful. However, is their an app where I can spoof a local number?

Do you mean you are trying to obtain a phone number with the same area code as where your shop is located? You can go onto Google Voice and create a number that will forward calls and texts to your actual number (from what I understand). Looks like you can choose what area code you want. I have not ever done this myself, so I don't know about reliability.

i am fairly new to the secret shopper world and i might need a little bit of help. One of my shops requires a phone number that shows up as a local number from the required state in my shop but i cant seem to find out how to get the number so they actually can call me back

there is an app you can download for free and use that to change your phone number. I think it is called burner.