I would never work security because the hours are shit and that means you won't have any free time to work on anything to get you out of wage slavery.
Any regular old cashier job is perfect. It's good to build up at some level of communication skills, doing the job made it become normal for me to talk to strangers and just strike up a conversation, and oddly enough it thought me how to smile "genuinely" on command. When I first started the manager had to ask me to smile lol, I had a dead pan face 24/7.
For me jobs aren't just about making money, they are about acquiring knowledge and skills for life too, and as an incel being able to "blend in" with normies is very useful.
Also more importantly than that, the hours are good and the work is very minimal. That means you don't feel dead tired all the time and you have the free time needed to wealthmaxx so that you can maybe one day escape wage slavery.