A very easy task to do, pull the handle and either push or pull the door*. It should open. If you can't do this, you will have to call for help; Or maybe you are just extremely weak. After doing this, you will be able to enter the bathroom (while the door is still open of course).
*If it doesn't open, you are doing the wrong thing. If you push it and it doesn't open, it's a pull door. If you pull and it doesn't open then it's a push door. If neither works then you are trapped, break down the door.
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How To Poop 101
RandomA detailed tutorial on how to poop correctly from the very beginning