Finding a job can be tricky. Is he just replying to advertisements online, or is he also waking into places, asking if they are hiring and getting an email and phone number for the manager? It’s better to talk to and email a manager directly if you can. You can apply to 100 jobs online and never hear back. You may also want to find a program that helps teens with these transitions. Dynamy in Worchester MA is one example. They can be expensive, but may have scholarships and may have other suggestions. An ADHD coach could help too. Someone to work with him who is not you, mine responds better when her therapist makes a suggestion than when we do. I think many teens just want to chill out after crossing the HS finish line. Mine graduated and is going to college, but was supposed to work for the last few months for her spending money. She has put it off and put it off with a million excuses despite us, her therapist and our family therapist all trying to get her to work. And despite the fact that we’ve provided her 0 money the last few months and her bank account is at 0. She’s had several jobs before and is capable of finding one. She just seems to want to hold on to complete and utter freedom for a bit longer. We can’t give her spending money so she’s going to have to figure something out. It’s frustrating and painful to watch, but sometimes they have to face their own consequences. In her case, college is going to be a serious bummer with no money to spend and we won’t pay tuition for year 2 if she doesn’t have her contribution (which she did provide for year 1). At some point the chickens will come home to roost.
For me, I couldn't just have a job. I needed a job where I could see the value in what I was doing. This is where volunteering comes in. He has a much easier time getting started, it can lead to professional relationships and networking, and it can help him gain momentum. I also saw it as getting a paycheck in the form of appreciation rather than money. If a place doesn't treat their volunteers like gold, consider volunteering elsewhere.
Connect him with a local not-for-profit job search agency. And by connect him, I mean drop him off at the door.
Does he have friends who are in similar situations? See if he'll partner up with them to work together to find a job/volunteer work. If not, there are job finding circles as well.
If he is receiving mental health support, often they can help on the job front as well, or can refer him to an agency that specializes in it.
Look up the "Personal Values Card Sort". When I was figuring out my next steps, vocational tests were a waste of time. Doing the values card sort was VERY helpful, especially when I only allowed myself to have 3 in the very important category and 10 in the important category. Looking at the list, I knew I needed to embrace those values and do things every day that spoke to those values.
Also, consider that for a neurotypical person, transitioning from school to the workplace is hard. Change is incredibly hard for someone with ADHD. Give him a bit of time, and ask him what HIS plans are. It could be that he knows what he wants and is having trouble getting from here to there. It could be he feels lost. It could be he has plans and has been taking steps that you don't see.
Remember that it's important to walk with him rather than try to push and pull him. Try not to "should" on him, instead give him reasons to do the thing, or ask him what's stopping him from doing the thing. If something seems simple, and he's not doing it, there's a reason you're not seeing. There's a growing belief in the world of psychology and sociology that believes that laziness does not exist. What we call laziness is actually a lack of motivation, unseen barriers, a lack of support, or other factors interfering with the individual's progress. I see that in my work all the time (I work on a mental health unit for people who have had multiple hospital admissions)... Overwhelmingly people on disability want to work, and put in a lot of effort to do so.
Right now he needs support, encouragement and understanding.
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School frustrations
11yo school refusal when with mom, aggression 
“Bad” first day of school
School Options Advice
