Business owners and everyday customers know that there will be times — like the holidays — when things get busy. When you’re transparent about why you weren’t able to come to the phone, people typically understand and are much more willing to be patient with your business. If the goal is to encourage more people to leave a voicemail, your greetings have to be actionable and clearly dictate what you want the caller to do. Having a caller go to voicemail is not the end of the world; it’s going to happen, so you have to make the most of it.
There's no single best way to craft an after hours greeting. The most important point is that you equip your customers with what they need to know, and give them an avenue to contact you, whether that's through voicemail, email, or other channels.

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.
The last few years have seen a huge rise in the use of automated voicemails and auto-attendant greetings. This has been especially true for the business sector, where professionals should record friendly and polite voicemails to greet their customer callers.