There are a few ways you can work for Amazon Fresh, Prime Now, or Whole Foods Blocks.
The best way to find out is to visit their website and look for open positions. You can also contact their customer service department and inquire about available positions.
There are also a few job sites that specialize in positions at Amazon Fresh, Prime Now, and Whole Foods Blocks. You can search for these positions on sites like Indeed, Glassdoor, and Monster.