Got curious, here is what I found trying this out in my garage.
On my 09 (no navigation, no center screen), the physical key only unlocked one door at a time.
On wife’s 16 (tech pkg) and 2010 G37 (navigation), physical key defaults to unlock all doors. For the G37, with car in “on” position, pressed “other”, then “comfort”, option to turn on/off the (forgot exact wording) “one touch lock/unlock”. That changes whether lock/unlock all at the same time.
You have a GT, I assume it has navigation/screen in the middle. Maybe give this a try. .
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