You can't unlock the keys.
-> find foo
-
-Nothing happens.
-
> find bar
Sorry, I don't know the word "bar".
> score
-You have garnered 32 out of a possible 430 points, using 102 turns.
+You have garnered 32 out of a possible 430 points, using 101 turns.
> z
> score
-You have garnered 32 out of a possible 430 points, using 104 turns.
+You have garnered 32 out of a possible 430 points, using 103 turns.
> quit keys
The grate is locked.
>
-You scored 32 out of a possible 430, using 111 turns.
+You scored 32 out of a possible 430, using 110 turns.
You are obviously a rank amateur. Better luck next time.