Alt bind

I recently have been unable to use my alt key, not sure why but ya, I can’t use it. I think it might have been unbound, but I don’t know the command to bind it. At this point you may be thinking that I can just go to settings. Well… I can’t for some reason the walk slowly command gets mixed up with the other #CS commands. Please I need to know this command, because the alt key is a big thing in RP.

bind alt “+walk”

Thanks!