Given this Django REST Framework view snippet using JWTAuthentication, what will happen if the token is expired?

Given this Django REST Framework view snippet using JWTAuthentication, what will happen if the token is expired?

from rest_framework_simplejwt.authentication import JWTAuthentication
from rest_framework.views import APIView
from rest_framework.response import Response

class MyView(APIView):
    authentication_classes = [JWTAuthentication()]

    def get(self, request):
        return Response({"user": str(request.user)})