The Secret Lab

You look from a distance and start thinking about what you should do.

You think for a moment and come up with two options, there's a guard standing outside the main entrance, he seems be alone. To the side of the main entrance, you see a small pathway that appears to go to the back of the facility. Maybe there's a way to distract the guard and go through that pathway.

So, you could knock out the guard or go round the back which most likely needs a key.

What do you do?