Lothraxi
Там "отпер заклинанием". Когда от Дурслей бежал.

Fred and George climbed catlike through the window into Harry’s room. You had to hand it to them, thought Harry, as George took an ordinary hairpin from his pocket and started to pick the lock.
“A lot of wizards think it’s a waste of time, knowing this sort of Muggle trick,” said Fred, “but we feel they’re skills worth learning, even if they are a bit slow.”
There was a small click and the door swung open.