2019 GMC Battery Drain

Drove 3 hours to a soccer tournament. Came back to the
the car to find that the car is dead after it sat in the parked
for 7 hours.  Nothing was left on.  Could not get it to kick
over until a friend said to take the key farb and hold it in
your hand as you push the engine start button and it kicked
over. Anyone else having issues with a dead battery?
The one weird thing is that the brake pedal was initially
hard to push down.  It was almost as if it was pressed to
many times and there was brake fluid in the line