Sharp AQUOS Crystal - Manual (Page 411)

Settings 402
5. After “Face captured.” is displayed, touch Continue.
6. Touch a backup unlock method in the case your phone cannot recognize your face.
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For Pattern, follow the instructions described in “Use a Screen Unlock Pattern” below.
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For PIN, follow the instructions described in “Use a Screen Unlock PIN” below.
7. Touch OK.
The screen lock is set.