CHAPTER III RELATES HOW OLIVER TWIST WAS VERY NEAR GETTING A PLACE WHICH WOULD NOT HAVE BEEN A SINECURE For a week after the commission of the impious and profane offence of asking for more, Oliver remained a close prisoner in the dark and solitary room to which he had been consigned by the wisdom and mercy of the board.
There are no more uses of "sinecure" in the book.
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He does have a job in the company library, an undemanding sinecure where he can do a lot of reading without bothering anyone, and occasionally he does a little research for one of the legitimate biologists on the staff.
William Styron -- Sophie’s Choice
After confessing to these things they had been pardoned, reinstated in the Party, and given posts which were in fact sinecures but which sounded important.