How do you open the boot on 307cc without the key?

To open the boot of a Peugeot 307cc without the key, you can try using the manual release mechanism, which is typically located inside the vehicle. Check the owner's manual for the exact location, as it may vary by model. If that doesn't work, you might need to access the boot from inside the car by folding down the rear seats, if applicable. Alternatively, contacting a locksmith or Peugeot service center for assistance is a good option.