Locked myself out of my BMW?

I was looking for some books in my trunk and I put the key down and left it there and I shut the trunk. I have a BMW 330Ci 2002. The Locksmith says he can open the car but he can't open the trunk. So how can I open my trunk? I don't care if the alarm goes off cause the key is in there so I can turn it off, but what can I do? I called BMW and it was useless, the best they can do is have me order a lockout key which I would not get until Wednesday and they said they need me to come down to pre-pay for the key and I asked "how am I supposed to go down there if I'm locked out of my car?" and the retard I was talking to said "I don't know sir". So what can I do to open my trunk? I need my car open ASAP