My dear Boss,
Know that I am merely an assistant.
I do not covet the cases that my partner longs to crack.
I am but acquainted with the plug that my partner brokers information from.
But I see through all the inner workings of each coil, pin, and shear line that my partner sweet-talks—
I am their tracker, while my partner
Tastes metal tangs as you taste fancy wine.
That’s why we leave the loosening of tongues to you,
And that’s why you leave the loosening of cases to us.
Our loyalty is unmatched so long as you command us well,
So do not feel frustrated if you do not hear me.
I am merely your accomplice.
Answer: The sound of a manual (like a pin tumbler) lock unlocking/locking