**Disclaimer:** I am not responsible for what your friend can do to you if he will notice that.
*But in any case...*
- you could ask him to give you that device unlocked instead of password
- you could ask him for access to some service (e.g. enter gift card/coupon code on site)

*Gray area:*
- you could brute force it
- you could unlock via biometrics while he/she sleeps

**Understanding all legal consequences**:
- you could install a keylogger on his device
- you could install a camera in his room or where the device will be located, while entering the password
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