public Instant getExpiration() throws JwtInvalidException  {
    return this.rawJwt.getExpiration();
  }
Returns the expiration time claim {@code exp} that identifies the instant on or after which the
token MUST NOT be accepted for processing. Throws a JwtInvalidException if no such claim is
present.

<p>This API requires {@link java.time.Instant} which is unavailable on Android until API level
26. To use it on older Android devices, enable API desugaring as shown in
https://developer.android.com/studio/write/java8-support#library-desugaring.
java_src/src/main/java/com/google/crypto/tink/jwt/VerifiedJwt.java