Swift Playground “Learn to Code 2” expert command “turnLockUp()”

There is a command “turnLockUp()” in expert. But I don’t know how to use. Run it before it step on the lock? Or run it when it is on the lock? Can anyone tell me?
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Yhtam
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Expert.turnLockUp doesn’t seem to work in 5.1 Learn to Code 2.

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Raycope
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