Odds are if it opened specific rooms or secret exclusive areas, they would be advertising that much more heavily because it would likely sell a lot of people on the concept.
On the other side of the coin, i really doubt that's feasible since you would either have to stop the line so that lantern holders could go through those areas on their own, which would likely anger people who didnt know what the lanterns were or cant afford to spend that kind of expense, even moreso if that feature isnt advertised. Or alternatively, if you don't stop the line, that will lead to a lot of non-lantern holding people following the lantern people into the special rooms thinking it's just part of the maze. Speaking from experience from my past, most guests who don't know the layout of a maze will just follow the people in front of them even if it's the wrong way, I've seen instances in some mazes I've worked where a blackout wasn't manned at a backstage exit and probably close to 100 guests followed each other out that exit into a backstage area until someone figured out what was happening and turned them back the way they were supposed to go, causing a major backup with all these people trying to get back on the path.
tl;dr if they did work like skeleton key, I imagine it wouldve been advertised by now. And it would probably work more like 2016's where theyre individual attractions rather than special rooms inside existing ones as to not cause line clogging or confuse general admission guests, and considering those havent been announced and nobody was cast for positions like that, i don't think that's happening either.