Hi Everyone,

I have an apex class that I have developed and tested that it works by calling it from a JavaScript button but now I want to schedule it to run daily to prevent someone having to press the button. My code is
 

global class DOUM_RetireDOUs implements Schedulable{

    global static boolean repeatedDOU(DOUM_DOU__c obj,List<DOUM_DOU__c> objects,String DOUName){ 
       
        for(DOUM_DOU__c rec: objects){
            if(obj.Id == rec.Id){
                continue;
            }
            else{
                if(DOUName == rec.DOUM_DOU_Name__c){
                    //if(obj.DOUM_DOUVersion__c > 1){
                        return true;                    
                    //}
                }
            }
        }
        return false;
    }
    
    
    
   webService static void checkUpdate(){
    
        List<DOUM_DOU__c> objects = [SELECT Id, Name, DOUM_DOUVersion__c, DOUM_Domain__c, DOUM_Requester__r.Name, DOUM_DOU_Approval_Status__c, DOUM_DOU_Name__c, DOUM_DofRetire__c, DOUM_RfR__c, DOUM_RetirePerson__c, DOUM_Retired__c FROM DOUM_DOU__c WHERE DOUM_DOU_Approval_Status__c ='Approved'];
        
        for(DOUM_DOU__c obj: objects){
        
    Integer Version = Integer.ValueOf(obj.DOUM_DOUVersion__c) + 1;
    String OldVersNo = String.ValueOf(Version);
    String Domain = obj.DOUM_Domain__c;
    String JoinDOU = '-DOU-';
    String Requester = obj.DOUM_Requester__r.Name;
    String JoinVers = ' V';
    String DOUName = Domain + JoinDOU + Requester + JoinVers + OldVersNo;
    
        system.debug(Domain);        
        system.debug(Version);
        system.debug(Requester);
        system.debug(OldVersNo);
            
        system.debug(DOUName);
        
        
        System.debug('if statatment'+repeatedDOU(obj,objects,DOUName));
            
        System.debug('obj dou name '+obj.DOUM_DOU_Name__c);
        System.debug('Dou name '+DOUName);
            
            if(repeatedDOU(obj,objects,DOUName)){
                  obj.DOUM_DofRetire__c = Date.today();
                  obj.DOUM_RfR__c = 'New Version Approved';
                  obj.DOUM_RetirePerson__c = String.ValueOf(obj.CreatedBy.Id); 
                  obj.DOUM_Retired__c = TRUE;
                  update obj;
            }
        }
    }
    
    global void execute(SchedulableContext sc) {
    
        DOUM_RetireDOUs CU = new DOUM_RetireDOUs();
        
        String DOU = '0 0 0 ? * MON-FRI';
        String jobID = System.schedule('RetireDOUs', DOU, CU);

        
   }

In the schedule apex I have set it to run Mon-Fri at prefered time of 00:00. In the list view of scheduled jobs my apex shows that it was submitted but never started. As well as this the code hasnt run and changed my data.

Any ideas?