The CRJ main cabin door is NOT a plug type door. It does NOT have to open inward first.
The only thing holding it in place is the pins and cams.
I am not aware of any pressure-based safety interlocks, so I would assume that if you pulled the handle open, the cabin door would open, and probably depart the airplane, possibly entering (and destroying) the left engine.
You would follow the cabin door into the engine in about 25 milliseconds.
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