A lockpick lets you break into other players’ vehicle trunks, and that includes police cars.
Getting a lockpick
Buy one on the Black Market. You can reach the Black Market through Lenny or the laptop at your base (see where to find weapons for both routes).
Why police cars are worth a look
Officers seize contraband as part of their job (see how to become a cop). Kefir lists cop cars as valid lockpicking targets, which makes them a tempting option for criminals.
Protect your own trunk
The same tool works against you. Since other players can open your trunk, don’t leave valuables in a vehicle longer than you need to. Move cash to Lenny’s or your bank and goods to your base (see where to stash stolen loot).
Related: get your own car, free rental cars.
