But, of course, you've got the key.
4 seconds sound clip from the Alice in Wonderland (1951) movie soundboard.
You can hear this line at 00:09:06 in the Blu-ray version of the movie.
Quote context
[...]
- You almost went out like a candle.
- But look. I'm just the right size.
- I forgot to tell you. I'm locked.
- Oh, no.
- But, of course, you've got the key.
- Don't tell me you've left it up there.
[...]