This is a great ask. I feel like he might end up doing a job with some manual labor because that's just what he's used to. Maybe working in construction, at a sawmill or lumber yard? I could also see him at a plant nursery where he lugs around heavy stuff and does odd jobs. Although I imagine Claire giving him a hard time about those types of jobs.
"You're getting old. Isn't that bad for your joints?"
“Thank you for that Claire, yes I am."
I could also see him working after hours at a place since I suspect he doesn't want to be around a lot of people. He could be a janitor or night guard somewhere. Though…he'd probably want to be home with Claire in the evenings so maybe not.
He'd want to do something very different from his old job. Oh, maybe he gets hired at a bakery and is just hopeless in the kitchen so they put him on the register, which would be hilarious. He can handle spy work and assassinations but he'd struggle so much with rude customers and a difficult POS system.
You watch Six hunt and peck at the keys of the old cash register, glaring down at it like it personally offended him somehow. The line of customers is growing longer by the second and you sigh when you hear the chime above the door jingle again, announcing a new customer.
"You said you had previous experience in the customer service industry," you remind Six, coming to stand beside him.
"Different type of service," he says, exhaling heavily when the register doesn't open. You jump when he pounds his fist on the side of it. The drawer flies open and he smiles. "That will be $10.95," he tells the elderly woman who has been waiting patiently for the last five minutes.
Her eyes widen when he grimaces at her; you're fairly certain he thinks it's a smile, bless him. Even though he's a hard worker, taking care of all the heavy lifting and cleaning after hours, your aunt still wants you to fire him because he's hopeless with customers. He was patient with them sure, but also slightly terrifying at times when he'd just stare at them without any expression on his face.
You know he's now what people expect when they stop in at the bakery you co-own with your aunt. Not even the bright pink apron he wears with the shop logo and cartoon cakes and cookies can hide the fact that Six looks like an extra from a John Wick movie.