Refresh Apex without any change in Database.

mycmp.html

<template>

    <lightning-input label={realFormData.FirstName} value={realFormData.FirstName} if:true={realFormData} onchange={updateValue}></lightning-input>

    <button  class="slds-button" onclick={myRefreshFunction}> Cancle edit</button>
</template>

mycmp.js

import { LightningElement ,wire,track,api } from 'lwc';
import myContact from "@salesforce/apex/ContactController.fetchContact";
import { refreshApex } from '@salesforce/apex';


export default class Myrefreshapextest extends LightningElement {


 @api wiredContact;
 @api realFormData;


 @wire (myContact)
        fetchedContacts(resp){
           this.wiredContact = resp;
           this.realFormData = {... this.wiredContact.data};

    }


    updateValue(event){
        this.realFormData = {...this.realFormData , FirstName: event.detail.value};
    }

    @api
    myRefreshFunction(event ){
        console.log('Refresh Apex called');
        refreshApex(this.wiredContact);

    }

}