How do you open the trunk of a Lexus ES 300 without a key and the open trunk button is locked?

If the trunk of a Lexus ES 300 is locked and you don't have the key or the trunk release button is not working, you can try using the manual key slot if available, often hidden beneath a cover near the trunk lock. Alternatively, you can access the rear seats to reach the trunk from the inside, if the seats fold down, or use a slim jim tool to unlock the trunk mechanism through the rear access point. If these methods are unsuccessful, it's advisable to contact a professional locksmith or your dealership for assistance.