What about maintenance for a large apartment building, a large condo association, a retirement facility? The kind of place that would pay good benefits, but value someone who knows enough about construction to know if carpet is being laid correctly, fix a leaky toilet without needing to phone a plumber, might want someone who is available in the evening or weekends and be less focused on whether they are on site at 9:00 am, etc.
I think it's always helpful for people to think about what/when they did their best work, not to focus on what/when they were the least happy. You might ask him to reframe this thought process, just because it will make it easier to see what and where he'd enjoy working, rather than having clarity about where he might really be unhappy working.