Thousands of inventors from every corner of the US have sent their pitches via homespun videos to Walmart, all for a chance to win the Get on the Shelf contest.

For the second year in a row, Walmart solicited entries in July from entrepreneurs and small-business owners hoping to get their product on the shelves of Walmart in front of millions of customers.

In August, the public was allowed to vote and the finalists were selected.

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In San Francisco, Gabriel Bestard's invention - the Goji Smart Lock - allows people to unlock their doors with their iPhones. The lock also captures an image of every visitor who approaches. So if you're not home and a loved one visits, you can unlock the door from afar using your phone.

Farther north in Menlo Park, Calif., Synette Tom is selling neighbors on the Gibi pet locator.

"It's quite simple how Gibi works," Tom said. "You attach Gibi to your dog's collar and if your dog goes missing … turn [the mobile app] on and up pops a Google map of your missing dog."

A pet owner can track their dog up to 10 feet using their smartphone and can create a virtual fence, so if the pet leaves the designated area, the owner is alerted with a text message.

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And outside Nashville, Tenn., one mother's invention is attempting to erase a problem every kid has at school.

"My name is Kimberly and my daughter … Audrey," Kimberly McCain says in her pitch video. "We own Eraselet, the bracelet that erases."

From a spray bottle and wipe in one to a hands-free umbrella holder and a sock sack that puts an end to those days of mismatched pairs, Americans with an idea are hoping to come out victorious.

Last year's grand prize winner - among nearly 4,000 entries - was Humankind Water.

ABC News' Eric Noll contributed to this story.

(ABC News)