EMI's Trunk Key can open car trunks, tool compartments, and other automotive locks.
 
Insert the flat, narrow end of the tool into the trunk lock and tap the 90º end with a hammer to push the lock cylinder out. Then, the hooked end can be used to spring open the latch. 
 
Size: 6 1/2" L x 3/8" W x 1/8" H
Weight: 1 oz