hold the key of something
hold the key to something

Could going green hold the key to your financial security in 2010?

His right hand was holding the key all the while.

By the time the stuff had gone through its entire process, no one individual would hold the key to the whole.

And they could hold the key to much more than that.

Nuclear energy, on the other hand, could hold the key to our future.

You hold in your hands the key to his freedom.

Only those who buy records hold the key to success.

And that is only known to the person holding the key.

He died the following month, still holding the key to his red box.

There was a wall in front of me and they held the key which would open the door to freedom.