Sammiscribbles Weekend Writing Prompt

A jangle of metal on a brass ring
All to use for opening
Keys in every shape and size
Antique or new, use to find the prize
As many keys to many locks
Open a door or a secret box
There’s also the most mysterious one
Held at bay for unlucky ones
It’s enclosed beneath the skin
Letting only very few in
We know that special key—
It opens the heart.