"Right, well the theory behind the spell is that when you strike the locked door, it's magic will work similarly to the accio, or wingardium leviosa spell, and will push the lock from it's original place, as far from it as it can go without breaking." he told the class. "So yeah, all you really have to do is speak the spell and tap the lock and you've unlocked it, but pronunciation is a must, and it's a picky spell, sometimes it doesn't work right." Jess told the class. "Now, for this lesson i want you to practice the spell on these," he said, waving his wand and conjuring a door for each of them. "They're all locked, and your task is to open them. Just for good measure once they've been unlocked they'll lock again and you have to unlock it again." Jess told the class. "So, go to it," he said, gesturing for them to go.
((You can't unlock it on your first post, i don't care if you already learnt the spell and have used this several times, the idea is i teach this to you, not that you practice what you know. So, three tries, 3 posts before you can unlock it.))