[Scenario]

Wrap your code in pawn tags, please! [ pawn ] [ / pawn ] (without all of the spaces)

pawn Код:

#include <a_samp>

#define FILTERSCRIPT

new LSPDGate;

public OnFilterScriptInit()
{
    LSPDGate = CreateObject(3055,1588.5000000,-1637.9000200,14.6000000,0.0000000,0.0000000,0.0000000);
    return 1;
}

public OnPlayerCommandText(playerid, cmdtext[])
{
    if(!strcmp(cmdtext, "/open", true))
    {
        if(IsPlayerInRangeOfPoint(playerid,10.0,1588.5000000,-1637.9000200,14.6000000))
        {
            MoveObject(LSPDGate,1588.5000000,-1637.9000200,19.4000000,2.0000000, 0.0, 0.0, 0.0);
            return 1;
        }
    }
    else if(strcmp(cmdtext, "/close", true))
    {
        if(IsPlayerInRangeOfPoint(playerid,10.0,1588.5000000,-1637.9000200,14.6000000))
        {
            MoveObject(LSPDGate,1588.5000000,-1637.9000200,14.6000000,2.0000000, 0.0, 0.0, 0.0);
            return 1;
        }
    }
    return 0;
}

public OnFilterScriptExit()
{
    return 1;
}

Not sure why it's returning 0. Do you have other /open or /close commands in your GM (or other FS's)?