Don't know why it locked, but I may be able to answer a few questions about
of the other things you've referenced in your post.
-- Doors will not lock with key in ignition and door open.
-- Remotes will not operate while key is in ignition.
-- If car is unlocked with remote and a door is not opened within 30
the computer presumes it was an inadvertent unlock signal, and
then locks the
vehicle and arms the security system.
Some automobiles have alarms on them that automatically lock and arm the
after the key is off a certain period of time. Since we typically
keys in the car while it's in the shop, we always roll down a
window to prevent
being unintentionally locked out of the car.
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