1. Insert the key in/into the lock.

2. I saw you put the key in your pocket.

3. He turned the key in the lock.

4. She turned the key in the lock.

5. She groped for her key in her bag.

6. I heard someone turn a key in the lock.

7. He inserted the key in the lock but could not open the door.

8. Don't be discouraged; it's often the last key in the bunch that opens the lock.

9. Make sure you keep the key in a safe place.

10. If the door won't open, try jiggling the key in the lock.

11. Leave the key in the lock.

12. I must have left my key in the ignition.

13. The machine can reproduce a key in two minutes.

14. She fitted her key in the lock.

15. Key in your password and press 'Return'.

16. Turn the key in an anticlockwise direction.

17. Please turn the key in a clockwise direction.

18. They put the key in the door and entered.

19. Key in the file name and press return.

20. She listened for his key in the latch.

21. I saw him put the key in the lock, turn it and open the door.

22. He could swing his key in the lock,but didn't open the door.

23. Inserting the key in the lock(http://sentencedict.com/key in.html), he turned it and pulled the door open.

24. Put the key in the ignition and turn it to start the car up.

25. The hollow sound of the key in the lock.

26. At about 7 - Mum's key in the lock.

27. Shine the torch on the lock while I try to get the key in.

28. To make doubly sure they would not be disturbed she turned the key in the lock.

29. He locked the heavy door securely and kept the key in his pocket.

30. According to Rachel's version of the story, they threw the key in the river.