Am I using Cache correctly?

Just last night I learned about Cache in Laravel, I tried to apply it to my app but I'm not sure if I'm using it in the correct way since I couldn't find a tutorial that does exactly what I need to do.

I have some customers that belong to a store_id same as my User. Since the customers list doesn't change often, I thought I could cache it forever, and update the cache anytime a new customer is added. Does this code block make sense, or is there a better way to do this?

On customer store() function:

        Cache::forget('customers.store_' . auth()->user()->store_id);
        Cache::rememberForever('customers.store_'.auth()->user()->store_id, function (){
            return Customer::all();
        });

(Customer model has a global scope that only returns customers that belong to user's store_id)

My second question is, in case I need to update a column on one of my Customers. Is there a way to update it in the Cache or do I need to forget and rememberForever the same data (Customer::all()) again?