Invisible Aligners/Invisalign is an effective approach for closing gaps between teeth ,but having said that it is a long treatment which varies from 8-18 months depending upon type of malocclusion, followed by retainers to prevent relapse.
If you are looking for a quick fix ,then you could go for Veneers/composite build up , provided the teeth are sound.
Next Steps
Visit Orthodontist for detailed evaluation