Schedulable

global class scheduledMonthly implements Schedulable {

   

    global void execute(SchedulableContext sc) {

List<User> lstUser=new List<User>();

     for(User obj:[SELECT id,name,lastlogindate,isActive FROM User where lastlogindate<=LAST_N_DAYS:30])

{

 User objNew=obj.id;

 objNew.isActive=false;

 lstUser.add(objNew)

}

if(lstUser!=null && lstUser.size()>0)

{

update lstUser;

}

 

    }

}