--irc.register_callback("channel_msg", function(channel, from, message)
    if from == "Sjele" and string.find(string.lower(message),"lock you sjbaot") then
        if lock == nil then
            lock = true
            irc.say(channel, "State has been changed")
            return
        end
        irc.say(channel, "Locked status altred")
        lock = not lock
    end
    --local is_cmd, cmd, arg = message:match("^(**)(%w+) (.*)$")
            --if is_cmd and plugin[cmd] then
                if lock == true then
                    if from ~="Sjele" then
                        irc.say(channel, "Baot is locked")
                        return
                    end
                end
                --plugin[cmd](channel.name, from, arg)
            --end
            --for k,v in pairs(callback) do
                --if type(v) == "function" then
                    --v(channel.name, from, message)
                --end
            --end
        --end --remove meh
    --end -- Does nothing, i will remove
--end)

Every line that has a -- is no need for you.