A vehicle lock and personal protection baton uses a telescoping construction to combine an elongated base and an elongated extension. The elongated extension slides within the elongated base in order to switch between configurations, specifically for use as a lock or for use as a protection baton. A locking mechanism couples the elongated extension with the elongated base, and a user can easily twist the locking mechanism to allow or prevent sliding of the elongated extension with respect to the elongated base. The elongated extension includes an end segment with one or more intermediate segments to allow for greater length. The end segment is slidably engaged with the intermediate segment, allowing the end segment to telescope with the intermediate segment. A first brace and second brace are connected to opposite ends of the telescoping body and inserted between a door frame and handle to lock a vehicle from the interior.