The key and the door

"You were looking for the key for years/But the door was always open!"I came across this line in the book "The white tiger" and it got me thinking, isn't that what we keep doing throughort our lives. Or are we just looking for the key, not even having a door to open?Or even if I find the key wouldn't I be bored as soon as I enter the door, and start looking for a new door and a new key ?I wonder if happiness is in the object or in the persuit of the object.