He took the keys to a customer's car, went out but was unable to unlock the car door,

Beware of the door with too many keys

The will to win, the desire to succeed, the urge to reach your full potential... these are the keys that will unlock the door to personal excellence.

Education is the key to unlock the golden door of freedom.

The dreams and passions stored within hearts are powerful keys which can unlock a wealth of potential.

Six bags of saline, ... That's how long it took my body to unlock, for my muscles to relax. I thought that weight trainer was going to get fired.