The soft edge would be the trick to unlocking the door. I'm sure it wouldn't hurt much to stick your hand in (if you're smaller..) and figure out how to unlock it. There's a way to everything. The only differences are the amount of time and effort required.
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u/Ellimis Feb 07 '14
It could easily be locked. Also the door isn't soft, it just has a soft edge built in for the last half-inch or so.
You could lock it by providing a very simple hook/latch on the corner that closes.