Change the password for the user (as root):
passwd username
Reset the login counter and unlock the user:
chsec -f /etc/security/lastlog -a "unsuccessful_login_count=0" -s username
chuser "account_locked=false" username
Change the password for the user (as root):
passwd username
Reset the login counter and unlock the user:
chsec -f /etc/security/lastlog -a "unsuccessful_login_count=0" -s username
chuser "account_locked=false" username