[Mean]

Freezes the player for 5 seconds:

pawn Code:

#define SECONDS 5 // Define how many seconds you want a player to be frozen. 
CMD:freezemefor5secs( playerid, params[ ] ) {
    TogglePlayerControllable( playerid, 0 );
    return SetTimerEx( "FreezeUnfreeze", SECONDS * 1000, 0, "i", playerid ); 
}

forward FreezeUnfreeze( playerid ); 
public FreezeUnfreeze( playerid ) {
    return TogglePlayerControllable( playerid, 1 );
}

If you really want a function (time in seconds):

pawn Code:

stock FreezePlayerForTime( playerid, time ) {
    TogglePlayerControllable( playerid, 0 ); 
    return SetTimerEx( "FreezeUnfreezeTimer", time * 1000, 0, "i", playerid ); 
}

forward FreezeUnfreezeTimer( playerid );
public FreezeUnfreezeTimer( playerid ) {
    return TogglePlayerControllable( playerid, 1 );
}

Example usage:

pawn Code:

FreezePlayerForTime( playerid, 5 ); // Freezes a player for 5 seconds.