How Do You Break A Master Lock Combination Lock Box?

What's Happening

Master Lock combination lock boxes use a 3- or 4-dial system with 1,000 or 10,000 possible combinations respectively. Don’t bother trying to "break" them—these locks aren’t built that way. Instead, you can reset or open them without the current code using the built-in reset feature or the manufacturer’s bypass procedure. As of 2026, Master Lock still won’t give out a master reset code or track user-set combinations—that’s their security policy in action.

Step-by-Step Solution

Resetting the Combination (Requires Open Lock)

You can only reset the combination when the lock is already open:

1. Open the lock with the current combination.
2. Find the tiny reset tool that came with the lock (usually a thin metal rod).
3. Slide the reset tool into the hole on the side of the lock body.
4. Push it in, then twist 90°—clockwise or counterclockwise doesn’t matter.
5. While keeping the tool in place, spin the dials to your new 3- or 4-digit code.
6. Pull the tool out. Your lock now uses the new combination.
7. Test it right away and jot down the new code somewhere safe.

Opening Without the Combination (Bypass Method)

No code? No problem—if the lock is closed, try this:

1. Gently tug upward on the shackle (that U-shaped metal arm) to add slight pressure.
2. Turn the dial slowly clockwise, listening for a faint click.
3. You’ll feel resistance at one spot—that’s a "false gate."
4. Write down the number where it catches. That’s likely one digit of your combo.
5. Repeat the process counterclockwise to find a second digit.
6. Once you’ve got two numbers, test combinations that start with those digits and end with 0 through 9.
7. This can take a while, but it works on most Master Lock boxes as of 2026.

If This Didn’t Work

Alternative 1: Use a Shim or Paper Clip (For Older Models)

Some older Master Lock boxes can be shimmed open:

• Bend a paper clip into an L-shape and stick the short end into the keyhole.
• Apply light pressure while gently pulling on the shackle.
• Rake the internal mechanism by moving the clip up and down.
• If the lock’s worn or not seated right, this might just pop it open.

Alternative 2: Contact Master Lock or a Locksmith

Still stuck? Time to bring in the pros:

• Head to the official Master Lock website for lock-specific help.
• You can request a replacement—just prove you own it (original receipt helps).
• Call a certified locksmith who knows combination locks. They’ll often open or decode the box without damaging it.

Prevention Tips

Lock boxes are handy, but losing access is a pain. Here’s how to stay in control:

• Write down your combination in a password manager or a sealed envelope at home.
• Pick a code you’ll remember but isn’t obvious—avoid 000 or 123.
• Test your new combo immediately after resetting.
• Keep the reset tool with the lock box or somewhere secure.
• Don’t hide the lock box in plain sight—like under the doormat or above the door frame.

Is there a way to break a combination lock?

Gently pull up on the shackle and hold it steady. Turn the dial clockwise, listening closely for a soft click. Start with firm pressure, then ease up as you spin—you’ll feel resistance at one spot. If the dial catches every few numbers, you’re pulling too hard.

How do you break a combination lock box?

1. Bend two safety pins into makeshift picks.
2. Straighten a second paper clip into an L shape.
3. Insert the L-shaped clip into the bottom of the keyhole and push it in.
4. Pull the straight paper clip out, raking it upward against the internal pins.

What are all the combinations for a 3-number lock?

Think of it this way: each of the three dials has 10 digits (0–9). Multiply 10 × 10 × 10, and you get 1,000 total possibilities. It’s not a huge number, but a Simplex Lock is trickier to crack because testing every combo systematically is harder.

Can a Master combination lock be reset?

Resettable combination locks let owners set their own codes. That means Master Lock doesn’t keep a record of your combination. You can’t reset it while it’s locked shut—if it’s attached to something, you’ll need a locksmith to remove it first.

How do you open a combination lock box without the code?

1. Bend two safety pins into picks.
2. Straighten a second paper clip into an L shape.
3. Insert the L-shaped clip into the bottom of the keyhole and push it in.
4. Pull the straight paper clip out, raking it upward against the pins.

How do you open a 4-digit Master Lock combination?

1. Find your combination first.
2. Line up the first dial with the first number.
3. Set the second dial to the second number.
4. Align the third dial with the third number.
5. Center the fourth dial on the bottom wheel with the fourth number.

Are key safes easy to break into?

Key safes keep your house or car keys secure—but if someone cracks them, it’s a major security risk. They’re not foolproof, so placement and lock quality really matter.

Can a locksmith open a combination safe?

A specialist safe engineer handles all kinds of safes, including:

• Combination locks
• Digital keypads
• Traditional key-operated safes

How many combinations can you have with 3 numbers?

Each of the three digits can be any number from 0 to 9. Multiply 10 × 10 × 10 and you get 1,000 total possibilities. In a set of 720 arrangements, each unique combo appears six times—but that’s just math, not a shortcut to cracking it.

Where is the best place to put a key safe?

• Don’t place it where it’s visible from the street.
• Avoid eye level—burglars check there first.
• Don’t make it look like a key safe—keep it discreet.
• Keep it near the door, but not in a spot that screams “look here.”