In the book flowers for Algernon
who is Algernon and why is he important

Algernon is the mouse that is going through the same experimentation as that main character he is important because the main character Charlie Gordon tries beat him in the maze and you can see the progress of time and the consequences of the experiment happen by comparing Charlies performance in the maze to his.  

Explanation:

the answer is subjective. i personally agree with the first answer for this question.

if one isn't strictly talking about objects then the correct answer would be 'my eyes' since according to this riddle i am asleep and in order to answer/open the door i need to open my eyes first of all.

however, if one is specifically looking for an object, then the first thing i would open would be the door

hope this !