Best Job For A Numismatic?

Both good ideas, maybe you could ask to see if a LCS is in need of help and hiring. Never herd of this before but it never hurts to ask. Plus you would obviously learn a lot about the hobby and it would certainly be a fun experience.

My suggestion....start your own business selling coins..eBay. Go and buy coins at auctions, buy from ebay, or other word of mouth sources. Get a local reputation you buy coins. If you sell quickly the amount of cash you will need on hand won't be that much and you will get to handle a lot of coins and have the ability to sell the ones you don't want to keep.

Help with a coin dealer?
I know of a geologist friend who got a temporary job like this.
I dunno if it is still temporary. He started in 1972. He is still there!
He is now one of Australia's leading commercial opinions on ancients, and a very experienced numismatic auctioneer.

Maybe find out which company empties the coin star machines and go to work for them.

This is so true. You would really be amazed at how many people have lost their jobs and even ended up with a crimial record by not being honest as to what they are doing.
Actually in many banks you are not allowed to put anything aside for later. And with all the cameras now in banks, it is becoming really tuff to try it. If you do go to a bank for a job of any kind, always remember to ask about looking for coins for yourself.
Same is true as a casheir at a store and remember at many stores there is no time to examine coins, no place to put them for later. And note too that with the massive amount of psying with credit and debit cards, there is less and less cash being used. And again in many instances, people pay with currency and you give them the coins. Seldom in a store people pay with coins.
IF there are any laundromats in the area, you may want to check with the owners if they can use some help cleaning up or filling soap type machines. And then also mention you'ld like to look through all the coins if possble. Myself, I'd love to own a laundromat. Imagine the massive amount of coins available.
Not sure if you drive but if there are any toll roads near you, might want to consider a job as a toll taker. Unfortuately more and more tolls are being done with those things people put in the windows instead of paying at the toll gates.
Juut remember as noted in the start of this reply, make sure any bosses know what you are doing.

It's about your coworkers and boss more than the transactions. I was lucky enough to work in a retail store with a manager who was okay with letting me comb through the tills, as long as I did it off the clock and as long as my till always balanced. I had some friendly competition with the old man in the cash office, but I was able to grow my collection substantially during my 4 year tenure at that store. I ended up with about $6 face in silver coins, a few proofs, a few dozen wheat cents, and quite a few 40s/50s nickels.

You're a bit young yet to stand a real chance at getting the job, but I would *strongly* recommend working at a gas station or liquor store if you're interested in getting the cool finds. I can't even tell you how many people used their "lucky dollar" to buy lotto tickets. One guy even spent a 50 year old $10 star note on a scratch off. Likewise, plenty of people decided to liquidate their half dollar collection into either booze or gas back in 2009. One of my coworkers spent over $50 in 40% halves on gas when his bank account reached critical levels (I wasn't able to get to them in time though :( ).

Also, I'd recommend that you avoid the bank teller job. They see lots of good stuff, but every teller I ever talked to was forbidden from sorting out the "keepers". My usual teller saved a solid roll of Buffalo nickels for me because she'd lose her job if she kept them for herself.

I worked in a supermarket in colorado one summer and it was mostly coins and bills coming in, because it was touristy, if I had been a coin collector then......... but I saved a few things, like Buffalo nickels and old pennies and things like that.

In my time I've never told anyone that I collect and have just been really careful about how I exchange coins that want. Now I don't work with coins at all, which is frustrating.