How to pronounce “latch key” in English

guy -- as a kind of lost person in many ways like a lot of kids. Feral child, as I think of him, who raisedhimself, essential. Single parent kid, we used to call latch key kids. Mother was at work all day, then is home briefly then is .out at night. His only friend turns out to be his only connection -- thing he could love -- person he could love -- is an iguana