Strange looks like a door, but no, it is indeed not a door, I mean the sign says so right...

Check out this stupid sign on this door, if it doesn't open then you can't come in, wtf of course if it doesn't open you won't be able to get in

A funny yet very environmentally friendly door sign. It is actually nice to see that we can and still sometimes do little things to lessen our impact on other lifeforms on this planet, after all we need them more than they need us.