Django ModelForm Validation not validating

Question

Can someone check what i'm omitting here? The Validation error is not showing up even when it should. It's just returning successful when it should've showed a validation error. When I run my server and insert a title less than 5 charcters, it still returns successful instead of raising a Validating error.

views.py;

def form_view(request):
    if request.method == 'POST':
        form = ProductForm(request.POST)
        if form.is_valid():
            post = form.save(commit=False)
            post.save()
            return HttpResponse("successful")
        else:
            return render(request, "product_create.html", {'form': form})
    else:
        form = ProductForm(None)
        return render(request, 'product_create.html', {'form': form})

models.py;

from django.db import models

# Create your models here.


class Product(models.Model):
    title = models.CharField(max_length=120)
    description = models.CharField(blank=True, null=True, max_length=250)
    price = models.FloatField()

forms.py;

from django import forms
from .views import Product


class ProductForm(forms.ModelForm):
    class Meta:
        model = Product
        fields = [
            'title',
            'description',
            'price',
        ]

    def cleaned_title(self):

        title = self.cleaned_data.get('title')
        if len(title) < 5:
            raise forms.ValidationError("This is not a valid title")
        return self.cleaned_data


template;

product_create.html:
   {% block content %}
<form action="." method="post"> {% csrf_token %}
    {{ form.as_p }}
    <input type="submit" value="save">
</form>`enter code here`

{% endblock %}