Same as Honda HON66 inner groove pick, the tool has two parts: wrench and pick. The wrench which holds the flap open and applies a gentle tension. Pushing the pick in and out repeatedly while inserted and the lock will be 'raked'.
The tool has half-diamond-like picks that are curved into the right tension to set the wafers in the lock. Some locks will open quickly and with ease whereas others might take a little longer.