Hello I will help you with your question,
Any time you have the fob in proximity to the trunk it will be unlocked so if you press the handle release the trunk will open. When you move the fob away from the trunk the trunk will be locked.
This is normal and expected.
Let me know what further questions you have about this
As soon as you move the fob out of range of the sensors inn the vehicle the trunk will be locked. In your case you found about 20 feet to do the trick.
It is your choice to accept a correct answer or no but I answered as soon as I saw your question when I logged onto the Just Answer website this morning. Prior to that I was sleeping.
Your vehicle is equipped with proximity sensors that will unlock the trunk when you approach with the fob inn your possession. This information is found in the owners manual.
If you need further information about the operation of your new vehicle please let me know
Thank you and please let me know if there is anything I can do to help you
Thank you for using JA!! again!