Green’s Dictionary of Slang

(UK Und.) 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 (3rd) F4: The tooles that doe the businesse are called Wresters.