In the US, the latch is not supposed to engage when using a J1772 plug, and the onboard charger. The latch is only used when DC fast charging with the CCS plug. This is not the case in countries where you bring your own J1772 cord to public AC EVSEs. In these countries, the latch does engage, to prevent cord theft.The latch is a safety feature to prevent pulling a 'hot' plug before shutting off tge power. The push button on the plug is supposed to signal the onboard charger and the evse (dcfc) to kill the juice, then it will release the latch. I guess you could cut off the hook, but you might arc your connection and damage it.