Door, lock and key hypothesis

And so there's this door
That looked somewhat inviting
Although there's no 'welcome' sign on it

I'd like to know what lies behind it
Whether if it's a mirror
Or a cliff that ends there and then

The only way to find out
Is to turn the knob
And open it

Is it locked?
Never try
Never know

Say it is unlocked
I'll get to the other side
And whatever happens happens

If it is locked
And the alarm goes off
Then things will go wrong

I tried asking someone
Who sees this door everyday
But of course who never tried entering

Said that it's probably locked
But the alarm may be disabled
Though it's better to steer clear from it

Should I try to find the key?
Does it even have one?
Or should I figure out the alarm's password?

I think I should just knock
And wait
And leave