It's mine, I tell you. My own. My precious.
Do I have the keys? No. Can we pick the lock? Also no.

I contacted a company who stocks spares for UK payphones, asking them to send me a set of keys to try.

They replied with "That will not be possible" and the following photo.

@jonty  hmm… has anyone tagged in @alice on this quest yet? 

@mycrowgirl they have now πŸ˜‹

@jonty do you happen to be located near Seattle? I'd open it for the fun.

If not, I might be able to walk you through opening it.

@alice @mycrowgirl Unfortunately I am ~4800 miles from Seattle, but thanks!

I have a local lock expertise so I'm sure we'll sort it...