And sure enough, there it sits in the lobby at the end of the corridor, its glass doors stuck ominously in the open position. Its every surface is covered in gleaming push-buttons—not just all the walls, but the floor and ceiling as well. And there's one final blazing yellow sign, this one alleging that this beautiful, miraculous machine is "OUT OF ORDER".
As a consequence of Mr Wonka's extraordinary genius, he had never met a system so complex that he couldn't hold every part of it in his brain at once. Naturally, this meant that every large system he built himself tended to mean absolute hopscotching gibberish to anyone else, because he simply had zero survival instinct for simplicity.
The Great Glass Elevator had been temperamental ever since Mr. Wonka's project to make it show up before you pushed the button to call it, and to bring you to your destination earlier than you had even left. This had been back in March, and after several Oompa-Loompas had gotten horribly lost somewhere in mid February, they had declared it entirely unsuitable. Mr. Wonka, however, found it "a perfectly expedient, if headstrong, mode of conveyance" and thought nothing more about it.
He had assumed the Oompa-Loompas would tinker with it if it bothered them. But what he hadn't appreciated until that very morning is that the Oompa-Loompas were entirely incapable of remediating the frankly perverse and arcane engineering abuses he had visited upon the machine in order to contort it into its current mode of functioning. They lacked his head for systems or, what is more likely, his diabolical willingness to commit any heinous kludge whatsoever to bend the machine to his will.
Anyways, the point is it was an ingenious, shiny death trap. Like so much else in the factory. And, as Mr. Wonka would have it, like most fun things that are worth trying.