Sounds like your car battery is dead. Cold weather and inactivity eats the RLX battery unlike any other car I’ve owned. I’ve been having to make sure I drive my car every day or my battery will act up in this cold snap. I know I need to replace it in the very near future.There is a little black toggle on the key fob. Press that while pulling and you will get the physical key to your car. This will open the doors for you to get in. Then you can pop the hood and hopefully you can either get a boost or hook up a trickle charger to get the car started. I’m surprised the fob won’t open the car if the battery is completely dead but I guess that’s the case. No way both fob batteries died in sync with the car battery... But don’t worry - there is most likely nothing wrong with your car other than it needs a new battery.

I’m glad at least your car is at home - I wondered if you were stuck somewhere. I’m sorry I misread your post - it’s your physical keys that aren’t allowing you in... Too bad they aren’t the original fobs which came with your car. I never would have thought to check that at the time of purchase...I would wait to touch base with your dealer and see what options they suggest. But it will certainly be helpful to get keys cut for your fobs - I suspect it won’t be cheap. You should get Carmax to foot the bill!