Put one of those google or apple things on them so big brother always knows where you and your keys are. Duh. Irl why don't you have a second set. I know your key has some new fangled electrogizmo in it to prevent theft, but you should have two of them. Use the extra until the other one turns up in your cat's litter box because he thought it needed to take a shit too or whatever.
If your vehicle is a 2012-2021 Hyundai or Kia which uses a physical key, just turn on the vehicle by opening the steering wheel cover and plugging any usb cable into the debug usb slot and the vehicle should turn on. I do not endorse or condone doing this to vehicles you do not own as that would be illegal.