Well, ok ...your terminals look clean. Ordinarily I would say, have the battery checked (load tested). You could swing by Harbor Freight and get a cheap battery load tester and just verify it's good. When my battery went out, I'd driven my Ram all over in the AM ...then it suddenly wouldn't start. There was enough voltage. But it failed the load test spectacularly. At least it rule out battery issues. It's possible your alt isn't charging enough and the battery has just run low.
Simple things you can try on the road is, as you go to turn the key, use some upward pressure on the key itself. Try that a few times. And even just wiggling as you turn and hold the key. A real common issue on these trucks is the module behind your key (called a WINmodule) ...the contacts can get flakey inside over time...or just oxidized up. And a heavy keychain can wear them. I would try starting it a bunch of times using whatever wiggling method you can. If you get it running, don't stop till you get home. The thing behind the key isn't a normal key switch, it's a whole module with circuits and things. There could even be weak/broken contacts in it. Chrysler used these on a lot of vehicles and there's a ton of DIY fixes on Y/T.
Another issue on these trucks, esp older ones, is the start relay in the fuse box could be flaky. It's one of the removable cube relays. You might try to swap the starter relay with another (like) relay. And I would probably wiggle and make sure all the fuses are seated.
Then, because yours is a 2011, there were a lot of TIPM issues. Mostly a fuel pump relay on the circuit board. That's your truck's computer. But usually it'll crank and crank ..just not start. The fix for that was to get a rebuilt TIPM (Totally Integrated Powertrain Module), or a guy can just solder in a new $10 relay onto the board too.
Corrosion at the connector under the TIPM was an issue too for some owners. I've seen some badly corroded connectors on this site. I mean to the point where it was toast. Being in NJ ...that's always a possibility. You probably want to have the truck towed home (if your're the DIY sort) or to your mechanic's place (if you're not), for those last two.