Well i read a bit and I understand that you will only be able to UNLOCK your TP if you set up a lock code from scratch by sending a cmd to your TP, if TP has a lock in place already that you wont be able to unlock. is this making any sense ? I think so, Terminator will only unlock code that it sets it up!!
You definitely can use lock command (assuming you have a TP LOCK SET UP).
If you dont have a TP lock going on then you can set one up via terminator and unlock via termoinator...that is enough locking dude