go to abmw dealer with your vin number..
how do you unlock the trunk of a 740il BMW with keys locked inside
Turn the key?
Crowbar
You will need to go to a BMW Dealership in order to get a replacement key. Unfortunatlly, you will also need to bring a heavy wallet.
Dealers only
On the sides of the radio cassette deck there are two flaps with Allen key screws under them just find the right size key and unscrew to the left and you can pull it out and from there work all the other parts out
Buy one
In the passenger door, turn the key to the unlock position (90 degrees) and play with the handle.
A new key for a BMW can be obtained by contacting your local BMW dealer. They will contact the factory in Germany that will make you a new key for your BMW.
The key assembly will need to be removed and the ignition lock will require replacement. It is a difficult task and might best be left to a professional.
Insert key and turn fully clockwise then push in knob and lift trunk
After you turn the key, you have to push in the trunk button (the key is in), that should open it up.