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If you turn the headlights and wipers on do the wipers seem to go really slow and are the headlights dim?
Based on the description that you're giving me everything indicates that the 12 V battery is below about 11 V this will cause everything in the car to go crazy. You need to get a jumpstart to the 12 V battery and see if the vehicle will ready on. 15 minutes is not long but if the battery is original it doesn't take long to kill the 12v battery. Especially if everything was lit up including the display.
It still sounds like a 12 V power supply issue from the 12 V battery. Firmly push the brake pedal down and push and hold the start button for about six seconds will it ready on or does the power off and allow you to remove the key fob?
Yes the 12 volt battery is located in the trunk on the right rear quarter panel area. Remove the plastic trays to expose the 12 volt battery. Also if you open the hood and the fuse block along the left side of the inner fender remove that cover inside the fuse block to go find a square red cap. If you pop that cap off and put the positive jumper cable to that and then the negative jumper cable or to any metal portion of the framework or engine that will power up the 12 volt system directly to the battery in the back it just saves you from taking everything out of the trunk. You will probably end up having to replace the battery in the back.
If the hatch won't open and it won't ready on you don't have a good connection going back to the 12 Volt battery at that spot in the fuse block. This is still not getting 12 volts to the system. Recheck your connections to that point under the hood and make sure you have a good ground.