[Schneider]

Yes, you gave the answer yourself already:

pawn Код:

public OnPlayerKeyStateChange(playerid, newkeys, oldkeys)
{
    if(newkeys == Whatever key) 
    {
        new closestplayer =  //Get The Closest player
        new target[4];
        format(target, 4, "%d", closestplayer);
        cmd_arrest(playerid, target);
    }
    return 1;
}