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11) Knowledge is a treasure,(http://sentencedict.com/key.html) but practice is the key to it. Lao Tzu
12) Insert the key in/into the lock.
13) The key fell on the ground with a jingle.
14) I saw you put the key in your pocket.
15) Too much force will twist the key.
16) We made a duplicate of the key.
17) Confidence is the key to success.
18) Use this key to toggle between the two typefaces.
19) Education was the key to upward social mobility.
20) Transport has always been the key to developing trade.
21) He turned the key in the lock.
22) There's a special key for winding up this clock.
23) He fumbled the key into the ignition.
24) I'd like a key to room 809, please.
25) I left my key inside my room.
26) Her key hung on a string around her neck.
27) He opened the door with his key.
28) She got the key stuck in the lock.
29) Sloth is the key of poverty.
30) I'd like to have another key, if that's ok.