Can someone clone your car key's unlock signal by sitting next to your vehicle in a parking lot and waiting for you to come back to your car?

I have a 2013 Lexus that has that proximity unlock feature where you just need to walk up to it and pull the handle to unlock but it's also old enough that the key fob continuously broadcasts the unlock signal. I also have an obsessive manager that I'm pretty sure has had private investigators follow me which leads me to today:

I parked in a huge mall parking lot today to go get food and was only gone for 5 minutes but within that time someone parked right beside me even though I parked on the edge of all the cars and there were legitimately hundreds of spaces next to me.

I was parked facing out and they were opposite so their driver door was right next to mine and the guy was leaned over so I couldn't see if he was holding anything. I was right beside his driver door briefly when getting into my car and was within 5 yards of him for about 15 seconds. Is that distance and time enough to copy the unlock signal for my car?

submitted by /u/onyoursidee
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from hacking: security in practice https://ift.tt/rUBCgVv