It's going to be challenging as most employers don't want to employ blind people. However my advice for your friend would be to look for something in in IT as a lot of blind people work in it.

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I think software developer is the most accessible job out there for blind folks, or at least that pays well if you're good at it.

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Hope things work out for your friend!

If he's a US citizen and resident,he should contact his state Vocational Rehabilitation office. They have specialist case workers that will assist them in assessing their career goals and interests and work with getting them placed in a job, often including paying for any outside training or education required. If the job is what He wants to do, not just what you think he needs, then he'll definitely succeed. I'm sure he appreciate super your support, but always make sure this is an endeavor he wishes to lead and undertake

If he really doesn't mind training/school he might consider law. I'm sighted but had a blind classmate back when I attended law school. Most law school textbooks are available in electronic form. Most lawyers spend the majority of their day typing/reading on a computer or talking on a phone. When you DO need to look at photographic or video evidence you can have your paralegal/assistant describe it to you. If something were to ever happen to cause me to go blind, I would not plan to leave the profession.

I’ve taken the training course by Deque university but haven’t taken the test for the certification. I highly recommend your friend taking the course to see if he’s interested.

https://dequeuniversity.com/curriculum/courses/iaap-cpacc#iaap-cpacc

If he gets a CPACC certificate he could work as an accessibility specialist to make web and mobile apps more accessible.

I work in tech and most of the blind coworkers I’ve worked with are in the accessibility/UX field.

What did he do as a shop assistant? And what is he interested in? What is he passionate about? There are so many accessibility tools amd tech is.constantly evolving so I would first try to see if there is a way to do what I like (safely of course) and go from there. What skills does he have? I would go to Voc Rehab as suggested, but have some ideas of my own before I got there. Just my opinion ..