How to escalate cases using Apex in Salesforce?

How to escalate cases using Apex in Salesforce? 

Here is the Sample Code:

Batch Class:

global class CaseEscalation implements Database.Batchable <sObject>{

    global Database.QueryLocator start(Database.BatchableContext bc){

        String SOQL = 'SELECT Id, IsEscalated FROM Case WHERE Status = \'High\' AND IsEscalated = False';

        return Database.getQueryLocator(SOQL);

    }

   

    global void execute(Database.BatchableContext bc, List<Case> caseList){

      list<Case> caseUpdatelist = new list<case();

        for(Case c : caseList){

            c.IsEscalated = true;

            caseUpdatelist .add(c);

        }

         if(caseUpdatelist .size()>0)

        update caseUpdatelist ;

    }

   

    global void finish(Database.BatchableContext bc){

    }

}

Schedulable Class:

global class CaseEscalationSchedule implements Schedulable{

    global void execute(SchedulableContext sc){

        CaseEscalation ce = new CaseEscalation();

        Database.executeBatch(ce);

    }

}

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