Skeleton Key

Skeleton Key (I am not sold on this title. One of my friends suggested "The Heart's Vault". Any suggestions for a better title?)

The key to my heart has rusted,
No longer naïve and brave.
The lock is titanium, cool and shiny,
You have to jiggle the key just right for it to turn.
Sometimes even I can’t get in.

I often misplace the key to my heart;
The key stays hidden for months at a time.
I found my heart blue and shaking,
It nearly suffocated the last time,
Cowering, cold and small in the corner of my ribcage.
Someone always finds the key eventually.

After you have passed the deadbolt,
My heart has a combination.
There are no numbers,
Just moments,
Moments to do the right thing.
Chances, if you will, to
Slowly release my heart from its grip.

I didn’t think it possible,
But somehow you’ve fooled my security.
My heart is left defenseless
And finally made to fend for itself.