When I was young, in the late 80s/early 90s, in Ontario, Canada, I read a novel in our school library. I believe it was specifically a YA novel, and may have been available though Scholastic, though I can't be sure of that. It was written in English, which I assume was the original language.
In the novel, the main character is named Gen – I can't remember the gender for sure. They have a piece of metal that they wear around their neck, which was given to them by their father. They set out in search of (or despite the presence of) "dragons", feared by the community.
Civilization seems to be very pastoral, and Gen leaves their village and goes on a journey, eventually finding some sort of cave or opening. They crawl into it, and it eventually is revealed to be a metal tunnel, perhaps a ventilation shaft. Eventually it opens up into a chamber where they find the so-called sleeping dragons – the cave is an ICBM silo. The metal talisman around Gen's neck turns out to be a missile launch key, handed down through the generations while its meaning had been lost. Similarly, Gen's name is revealed to be short for general, having been shortened and passed down from their ancestor, who owned the launch key.
From here things get hazy – either I've forgotten the rest, or I didn't finish the book. Obviously the implication is that the setting is post-apocalyptic, but I don't think it was the common post-apocalyptic wasteland, but rather the pastoral "return to simpler times" style that might suggest that it takes place long after the apocalyptic cataclysm.
I had initially conflated these memories with those of another book, which turned out to be Monica Hughes' The Guardian of Isis, but this is definitely something separate, though the pastoral post-apocalyptic setting is similar to the luddite colony of Isis.