I've never met Keanu Reeves.
But some fans have, and they've asked him to sign an autograph or take a picture with them.
As far as I know, he is always as gracious and willing as the situation allows.
I've heard stories from other fans and have seen their pictures and one thing I've noticed in many of the pictures is what some refer to as The Face.
Keanu has a standard "picture with a fan" face.
I can't say as I blame him, I know I would probably get tired of posing with strangers all the time.
I don't think The Face is any kind of reflection on how he feels about the fan, in fact I have heard of him being very animated in conversation with a person and then, right as a finger presses a shutter button, he'll don The Face. I don't know why. I'm sure he has his reasons.
After giving it some thought, I think that I personally would want to spend my 30 seconds in conversation with him. I'm not sure what I would say but I think exchanging a few words would mean more to me than his signature on something or a picture with him. And hopefully the muse of witty banter would visit me in those 30 seconds and maybe it would mean more to him, too. I know I wouldn't make him swoon, and I doubt I'd be clever enough to make him think.......but I'd really like to make him laugh.
In any case, as a service to anyone who might want a picture with Keanu but might never have the chance, and to Keanu himself who might want a little less time on display, I give you this:

It's pretty self-explanatory....