@NonCPS
def nonCpsTest() {
    def list = [
        ['CreationDate': '200'],
        ['CreationDate': '300'],
        ['CreationDate': '100'],
    ]

    def rval = list.sort true, { it['CreationDate'] }

    echo "Rval=$rval"
    echo "List=$list"
}

pipeline {
    agent any
    stages {
        stage('default'){
            steps {

                script {

                   nonCpsTest()
                }
            }
        }
    }
}