Apex: tiny example util for lock / unlock files

Util_Locker.cls

//from https://github.com/mshanemc/processBuilderBlocks
public with sharing class Util_Locker {

  	public static void LockRecord(list<string> recordIds) {
      Approval.lock( dedupe(recordIds) );
    }
    
   	public static void UnLockRecord(list<string> recordIds) {
		  Approval.unlock( dedupe(recordIds) );
	  }
    
    public static list<string> dedupe(list<string> input){
		  set<string> temp = new set<string>(input);
		  return new list<string>(temp);
	  }
}