Use your key
From Fallen London Wiki (Staging)
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From: An Intricate Lock
The key's teeth splay out in all directions – do they move when you're not quite looking at them? This seems like the lock that it fits.
Unlocked with 
Success
Click
The key turns more times than would seem strictly necessary. But the door swings open.
You've lost 1 x Intriguing Key
You've gained 2 x The Burglar's Progress
