Looks like someone reset a clock around here
Anyway, you disabled root access and your administrator account
is in fact a member of wheel but you are not able su or sudo to
root access? What are the permissions on those utilities?
I wonder if you are missing any permission flags or set to root only?
You may need to re-enable root access and login as root to the shell
and poke around a bit checking permissions of sudo both on the file itself
and what is setup /etc, /etc/ssh configs, etc.
May also want to make sure your admin user is loading up with a standard
shell instead of jailshell which will also effect what you can do.
Hope that helps