Hello and Welcome.
First a question? How did you level it? Most use blocks under the tires but I have seen some use the jacks to level the camper.
Now a suggestion. If you have the jacks down put them up and then try the door. If one jack is a little too tight it might have the camper in a twist.
One more thing to check is your deadbolt also locked. I ask this because the wife sometimes forgets she locked the lock and the deadbolt. And it does like you described - unlock then the door clicks but will not open - unlock the deadbolt and it opens.
Hope it is something simple. Happy Camping