Sets the minimum length of the lock screen PIN

If the policy is set, the configured minimal PIN length is
enforced. (The absolute minimum PIN length is 1; values less than 1
are treated as 1.)

If the policy is not set, a minimal PIN length of 6 digits is
enforced. This is the recommended minimum.

Sets the minimum length of the lock screen PIN:

Registry Hive	HKEY_CURRENT_USER
Registry Path	Software\Policies\Google\ChromeOS
Value Name	PinUnlockMinimumLength
Value Type	REG_DWORD
Default Value
Min Value	0
Max Value	2000000000