Green’s Dictionary of Slang

a pick-lock.

1591		Greene Second Part of Conny-Catching in Grosart (1881–3) X 86: In Lifting Law. The Pickelocke is called a Charme. He that watcheth, a Stond. Their engins, Wrefters. Picking the lock, Farsing. The gaines gotten, Pelfrey.
1608		Dekker Belman of London F4: The Picklocke is called a Charme.
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.
1809		G. Andrewes Dict. Sl. and Cant.
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.
1835		G. Kent Modern Flash Dict.
1848		Flash Dict. in Sinks of London Laid Open.
c.1850		Duncombe New and Improved Flash Dict.
1859		Matsell Vocabulum.
1881		Trumble Sl. Dict. (1890).