The intelligent key on the Nissan Juke does not automatically lock the doors when you walk away.
Didn't on my Juke, didn't on my Leaf.
Here's Nissan's own info about the intelligent key and it states locking/unlocking has to be done via the key or by the door handle button (what they call the 'request button').
https://www.nissan-global.com/EN/TECHNO ... W/iks.html
PS I just checked with a mate who has the latest Leaf and he confirms it's still the same, no auto-lock when you walk away, still got to press the door handle button.