They probably open outward ?
You can see the 'handles' and the other metalwork might be to keep them from being forced inward if someone decides to push instead of pull ?
Then again, on closer examination it looks like they slide.
The doors aren't flush with the walls and the outer metal bits seem to be on tracks at the top.
Not as secure but interesting in that people trying to storm in would try to push or pull first and lose time.
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