Just like in the 1991 animated movie, the new Beauty and the Beast depicts Belle as being trapped within the Beast’s castle in exchange for her father, Maurice, going free.
However, just because she agreed to stay there for her father’s sake doesn’t mean she has to stick around.
Even though this Beauty and the Beast will be overall faithful to its animated predecessor, I wouldn’t be surprised if one of the differences in this new version is if Beast breaks the door down when Belle doesn’t come out, otherwise she’ll likely make a break for it.
His enchanted servants, like Lumiere the candelabra and Mrs. Potts the teapot, do their best to get him to cool off and work the charm, but he’s successful with neither.
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"Dinner Invitation" Clip - Disney's Beauty And The Beast