More often than not, your locksmith will use a pick set and other tension tools in order to take care of home lockouts. Tension tools are built for locksmiths so that they can put them into your lock and get your door open without breaking anything. Another consideration is when they have to take out a broken key. Broken key extractors are special tools that use something like a set of tweezers to carefully remove your broken key without damaging the inside of the lock. In rare cases, they will need rekeying tools to be able to rekey your lock, or lock installation tools if they need to replace your lock because it was broken or damaged.