Get a list of certificates in a given Windows environment from C#.

The Certificate POCO below is my own invention. Don't read too much into it. I'm just keeping X509Store from bleeding out of the infrastructure layer.

using System;
using System.Collections.Generic;
using RefreshCerts.Core.ExternalDependencies;
using System.Security.Cryptography.X509Certificates;
using RefreshCerts.Core.Objects;
 
namespace RefreshCerts.Infrastructure.ExternalDependencies
{
   public class CertificateAuditing : ICertificateAuditing
   {
      private Dictionary<string, StoreName> storeNames = new Dictionary<string,
            StoreName>()
      {
         { "AddressBook", StoreName.AddressBook },
         { "AuthRoot", StoreName.AuthRoot },
         { "CertificateAuthority", StoreName.CertificateAuthority },
         { "Disallowed", StoreName.Disallowed },
         { "My", StoreName.My },
         { "Root", StoreName.Root },
         { "TrustedPeople", StoreName.TrustedPeople },
         { "TrustedPublisher", StoreName.TrustedPublisher }
      };
      
      public List<Certificate> Audit(int days, ITimekeeping timekeeping)
      {
         List<Certificate> certificates = new List<Certificate>();
         DateTime future = timekeeping.GetDate().AddDays(days);
         foreach (KeyValuePair<string, StoreName> storeName in storeNames)
         {
            X509Store store = new X509Store(storeName.Value,
                  StoreLocation.LocalMachine);
            store.Open(OpenFlags.ReadOnly);
            foreach (X509Certificate2 certificate in store.Certificates)
            {
               if (certificate.NotAfter < future)
               {
                  certificates.Add(new Certificate()
                  {
                     Locale = storeName.Key,
                     Name = certificate.FriendlyName,
                     SerialNumber = certificate.SerialNumber,
                     TimeToDie = certificate.NotAfter
                  });
               }
            }
         }
         return certificates;
      }
   }
}