How could Hans lock the door where he left Anna, when Du could only lock doors from the inside?

I totally just figured this Frage out when I was watching the movie... for somewhat the fifteenth time. Is there some sort of door in which Du could lock it from the outside?

This particular scene also happened in Cinderella, am I right? So, I'm really wondering how this is possible...
 WinterFirefly posted Vor mehr als einem Jahr
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Book-Freak said:
Most doors can be locked from both sides (bathroom/toilet doors being the exception). For example, I can lock my back door from the inside and the outside.
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posted Vor mehr als einem Jahr 
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Is that so? Hmm... Thanks! :3
WinterFirefly posted Vor mehr als einem Jahr
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Wait, but... if Hans locked it from the outside, why can't Anna open it from the inside?
WinterFirefly posted Vor mehr als einem Jahr
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Because Hans took the key.
Book-Freak posted Vor mehr als einem Jahr
bmazing said:
Some doors can be locked from both sides,but I don't see how Hans could have the key.
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posted Vor mehr als einem Jahr 
cktrip3068 said:
He had a key.When he walked out of the room he turned took out a key and locked it.
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posted Vor mehr als einem Jahr 
Simmeh said:
Key oder not, she was weak and would most likely have died had Olaf not arrived and gegeben her the warmth and hope to carry on.
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posted Vor mehr als einem Jahr 
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Wow, a snowman giving a freezing girl warmth....
Themitz posted Vor mehr als einem Jahr
Themitz said:
In the olden days, keys unlocked doors from either sides, but in order to unlock the door, you'd need the key. And in that case, Hans took it.
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posted Vor mehr als einem Jahr 
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