Unhooked battery and accidently closed the trunk. how do i open

You are going to need to get twelve volts to your system somehow,your frame and engine are the ground or"neg",,now you need to find the big thick red wire coming from the trunk and going to your engine compartment,you will need to hook up another battery with jumper cables or a battery pack,red to red black to black or a bolt on your motor.then try your key