You insert the key and turn it 1/4 turn clockwise to unlock. Then you can remove the key (or leave it in, doesn't matter either way) and depress the button to open the trunk. To lock it you put in the key and turn it 1.4 turn counter clockwise.

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“No cop born isn't a sucker for a finely-executed hispeed Controlled Drift all the way around one of those cloverleaf interchanges. Few people understand the psychology of a traffic cop. A normal speeder will panic and pull over to the side when he sees the big red light and start begging for mercy. This is wrong. Contemptuous to the cop-heart. When running along about a hundred and you find a redflashing CHPtracker on your trail you accelerate.”
- Hunter S. Thompson,