Lockpicks

TL1
Lockpicking involves manipulating a lock’s components to open it without its key. Tumbler, rotary, and barb-spring locks can be picked one-handed, while warded rotary locks require two hands; see Locks (pp. 120-121).

• A set of Lockpicks – possible at TL1, but unlikely before TL2 – would include probes and a set of blank keys of different sizes, and be basic equipment: $50, 0.2 lb.
• A good-quality kit (+1 to skill) includes a more complete set of blank keys: $250, 0.5 lb

Source: GURPS 4th - Low-Tech, page 128