Hi, how do I get my son's password? He is becoming so unruly these days?

I would favor some sort of punishment.  There is no need to go through his personal things unless you believe he is engaged in something dangerous.

Taking away his electronic devices like laptop, smartphone, ect... Would be a better idea.

If he is unruly you take away whatever needs a password until he GETS ruly. Getting his password just means he gets to pick a new one and continues being unruly.