Piano
donkey and monkey
Open the keys with the door.
a piano
A piano.
a piano
A Piano
Keyboard
Mon-keys Don-keys Piano keys
A piano.
A piano.
donkey and monkey
The three keys that won't open a door are a piano key, a skeleton key, and a computer key. A piano key produces music, a skeleton key is a metaphorical term often used for a key that can operate many locks but is not intended for regular doors, and a computer key simply refers to the keys on a keyboard. None of these have the practical function of unlocking a physical door.