[Cjgogo]

On top of your gamemode,or wherever before the command:

pawn Код:

new coutn;
new counttimer;

forward JailTime(playerid);

pawn Код:

COMMAND:adminjail(playerid,params[])
{
   if(!IsPlayerAdmin(playerid)) return SendClientMessage(playerid,COLOR_RED,"You're not admin");
   else
   {
      new time,playerid2;
      if(sscanf(params("ud",playerid,time)) return SendClientMessage(playerid,COLOR_RED,"USAGE:/adminjail [ID] [Time(in seconds)]");
      coutn=time;
      SetPlayerPos(playerid2,JAIL COORDINATES);
      counttimer=SetTimerEx("JailTime",1000,1,"i",playerid2);
      SendClientMessage(playerid,COLOR_GREEN,"Player has been jailed");
      SendClientMessage(playerid2,COLOR_RED,"You have been jailed by an admin!");
   }
 return 1;
}

After the command:

pawn Код:

public JailTime(playerid)
{
   countn--;
   if(countn<=-1)
   {
      KillTimer(counttimer);
      SetPlayerPos(playerid,OUTSIDEJAIL COORDINATES);
      SendClientMessage(playerid,COLOR_GREEN,"Unjailed!");
   }
 return 1;
}

I typed this in less then 5 mins,so,adapt it to your specifications :P