Added isExpired method

src/Entities/Interfaces/TokenInterface.php

@@ -76,4 +76,10 @@ interface TokenInterface
      * @return ScopeEntityInterface[]
      */
     public function getScopes();
+
+    /**
+     * Has the token expired?
+     * @return bool
+     */
+    public function isExpired();
 }

src/Entities/Traits/TokenEntityTrait.php

@@ -123,4 +123,13 @@ trait TokenEntityTrait
     {
         $this->client = $client;
     }
+
+    /**
+     * Has the token expired?
+     * @return bool
+     */
+    public function isExpired()
+    {
+        return (new \DateTime()) > $this->getExpiryDateTime();
+    }
 }