Keeping your truck locked while in your RTT

I have spent a ton of time camping this summer as we have been on a big road trip. The one thing that has been driving me crazy is if I’m sleeping in the rooftop tent and have my keys with me I’m close enough to the vehicle that you can walk up and pull on the door handle to have it unlock using the proximity. Is there a solution to this that I don’t know? Do I need to buy a faraday bag for my keys? Looking forward to hearing ideas. TIA