Definitions

1. noun

a small tool or instrument for picking locks, especially a device that can be hidden on the person; a person skilled in the art of picking locks, often used for burglars or thieves

“The thief was caught with a picklock in his pocket.”

2. verb

to open a lock (especially a door or box) by picking or manipulating the mechanism

“She managed to picklock the old chest and find the treasure inside.”