My routine is to reverse park (in garage)
Into (P)ark, power down, turn off lights as they stay on till you lock car, depending on setting
I know lights are off before I get out because they illuminate the inside of the garage door
Then, randomly, when I'm climbing out I get the short series of rapid beeps which I assumed was my thigh squashing the fob button as I climbed out as the garage space isn't that wide