You have a car switch. If it is three position as you said, it's still just ON/Off. Two OFF's and one ON. BUT............something is weird, the switch was designed to be keyless from 12 to 1. No way to move this switch without a key. So something or someone is mixed up. Maybe me.
The term locked and unlocked has no meaning. If you need a key for any position, it's always locked. To function, as described, you need the lever handle or the 55/56 and up Chevy car, snout switch.
The confusion may be that you found a picture of a switch and posted it here and it's not the same part number you actually have. So be sure of what you actually have and where you got it and the part number. Don't assume.
