MyScheduler

global class MyScheduler implements Schedulable {
	
    global void execute(SchedulableContext ctx) {
		// The query used by the batch job.
		String query = 'SELECT Id,CreatedDate FROM Merchandise__c ' +
			'WHERE Id NOT IN (SELECT Merchandise__c FROM Line_Item__c)';
	    CleanUpRecords c = new CleanUpRecords(query);
		Database.executeBatch(c);
	}
    
    global static void RunInOneMinute() {
        Datetime d = Datetime.now();
        d.second();
        MyScheduler p = new MyScheduler();
        String 	second = d.second() + ' ', 
               	minute = (d.minute() + 1) + ' ',
            	hour = d.hour() + ' ',
            	day = d.day() + ' ', 
            	month = d.month() + ' ',
            	dayofweek = '? ',
            	year = d.year() + '';
        String sch = second + minute + hour + day + month + dayofweek + year;
        System.debug('Schedule: \n' + sch);
        system.schedule('One Time Pro', sch, p);
    }
}