Performing Click on an ElementRef object in Angular 4

Question

I want to perform a click on an element of html page from its component class.

I have obtain the reference of the element in component class like this

@ViewChild('secondForm') input: ElementRef;

Now I want to perform a click on this input from a function lets say clickOnInput like this

public clickOnInput(){
 this.input.click() // I cannot find this function,
}

Is there any way or any other method to click on html elements from Angular's component class?