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“They returned to the gallery and circled its rim, then went down a short hall. Scrap's tail twitched angrily when they reached Tristan's door: it was shut. Daine grabbed the knob. It stung her hand, making her yelp. "Kit? This ones magicked. Can you do anything?"

Kitten stood on her hind feet and peered into the lock, then whistled two cheerful notes. Nothing happened. She scowled and whistled again, less cheerfully, more as a demand. Nothing happened.

Daine was trying to decide what to do now when the dragon moved back and croaked. The lock popped from the wood to land at Daine's feet, smoking, and the door swung open. Kitten muttered darkly and kicked the lock mechanism aside as she went in. Daine followed, trying not to laugh.”
― Tamora Pierce, Wolf-Speaker