global class abc_RiskSchedulerProcessor implements System.Schedulable {
    global abc_RiskSchedulerProcessor() {

    }
    global void execute(System.SchedulableContext SC) {

    }
}

Datetime sysTime = System.now();
sysTime = sysTime.addSeconds(5);
String chron_exp = '' + sysTime.second() + ' ' + sysTime.minute() + ' ' + sysTime.hour() + ' '
   + sysTime.day() + ' ' + sysTime.month() + ' ? ' + sysTime.year();
abc_RiskSchedulerProcessor scheduler = new abc_RiskSchedulerProcessor();
System.schedule('RiskScheduler',chron_exp ,scheduler);