timekpr: inadvertently locked myself (admin user) out & can't boot - how to fix?

[m654321]

I would imagine logging in as root and going from there would resolve it.

Yes, that was the first thing I tried, in an attempt to get into the etc/security/access.conf and etc/security/time.conf  files and edit them from root,
using the live environment (DVD) as I couldn't boot-up properly.

To do that I logged in as superuser  (sudo su), followed by the code I showed in my 1st post on this thread, though this didn't seem to work. 
I think that's more my inexperience in knowing how to access root files more than anything else.  I thought sudo su, followed by the requested
password input, gave me root user rights, but it didn't seem to happen. You might be able to advise me on how to access root files so as to edit
them.

Thanks again technomancer for feedback - I'll post any  solution on this thread, if I find one...

I have to add that the timekpr software (GUI-based) is great for limiting children's computer time to a reasonable daily amount. For example,
my son won't take any notice of me telling him when to stop  > , but he doesn't argue with the PC when timekpr informs him that he only has 2
min left to automatic shutdown! 

Mike