For a pshychic another mind would appear like a hugely bright light, now if we assume that a Pshycic Lock is the Pokemon's ability to See this mind and hold it in its gaze (psychically, ie not needing line of sight to know theyre there) then dancing around doing a Jim Carrey Impression screaming OOGABOOGA! isnt going to break it.

Pretty much any pokemon that has no Psychic ability with which to fight back would be helpless (look at the Sabrina Gym Battle with Pikachu vs Kadabra)
Of course this doesnt really work for ASB so something would need to be decided.