Problem with stopping the AVAudioPlayer

I am trying to make an app where it will play an audio for a set amount of time from the user. I am currently using this code below in the viewDidLoad() function. At the top of the class I have created a
var player:AVAudioPlayer = AVAudioPlayer()
I get the audio to play no problem, but the problem starts when I try to pause or stop the audio. I have a pause button that I want to stop the audio but I can not seem to figure out how to stop the audio. Below I have attached some of the different lines of code to stop the audio but none of them work.

     do {
                let sound = Bundle.main.path(forResource: "audio1", ofType: ".mp3")
                try player = AVAudioPlayer(contentsOf: URL(fileURLWithPath: sound!))
            } catch{
                print("Error in the audio file")

None of these will work when I try to stop the audio, I want to pause it because I will be having an option to either resume the timer with the audio, or cancel out and end the current session.

     player.volume = 0.0

Any help with this would be greatly appreciated!

I have also tried to start the audio with player.start() and I get the same results where it will not stop the audio later on.