5. You have reached [your business]. We are currently closed. Our normal hours of operations are from [hours] [days]. We are closed on [days]. Please leave us a message with your name and number and we will return your call when the office reopens. You may hang up after leaving your message or press the [key] for additional options. Thank you for calling.
No matter what your call processing components, from Auto Attendants, to IVR, ACD and Voicemail, your organization should present a unified sound that represents your brand. Phone menu prompts, produced professionally, give your call processing clarity and brand identity every time your customers and prospects call. The way your organization is heard, especially during first impressions, can directly impact client successes and failures.

Though it may seem weird and nonsensical to you, it really works. When you smile as you speak, you are able to sound happy, cheerful, and upbeat. Don’t knock it ‘til you try it.
You might also consider giving them the option to skip your voicemail message completely by pressing another key (again, check with IT). You also want to make callers aware what you will return their call, instead of telling them that you will try to return their call--and let them know when you are likely to do it, if possible. If necessary, provide additional or emergency information in your voicemail greetings. My dentist, for example, lists his cell phone number for emergencies.