Does red button turn screen off/lock screen?

So I have a newly refurbished Sprint Blackberry 8330. When I got it, I used it for about a month, then upgraded. I had it packed away, then sent it to my aunt, who never used it, and gave it back to me recently.

I plugged it in and am thinking of selling it, but I noticed when it's on, if I press the red hang up/power button, the screen doesn't turn off or lock or anything. Once the screen has blacked out, if I press it, it will turn on, so the button physically works.

I can't remember if this is an expected behavior or something needs to be flipped in settings. I want to make sure it works before selling it.

Alright, I think I figured it out. I had a rubber case on it, so the mute/standby button didn't really stand out much. That's what I was looking for.

Cheers