I have unfortunately done that three times connected to orienteering - 1 at a meet at 5.00am in MN one on way to airport in Grand Rapids and the worst in Harriman State Park when planning for an event where like you I left it in the trunk, before the days of levers to open trunk. 3 hours later and $110 the poorer, the locksmith had dismantled my passenger door lock to make a new key on site to get in.