LockTop – Sistemas de Segurança is a locksmith and security company based in Montijo, Portugal, serving Greater Lisbon, Setúbal, Lezíria do Tejo and the Oeste region. The company provides residential and business security services, with emergency locksmith support advertised around the clock and arrival times of up to 30 minutes in the Lisbon and Setúbal metropolitan areas.

Its services include emergency door opening, lock installation, replacement of cylinders and anti-burglary components, and repairs for jammed locks or broken keys. LockTop also installs smart locks and access-control systems, including options operated by smartphone, code, fingerprint or Wi-Fi. Additional offerings include garage-gate automation and integrated home automation systems.

The company says its technicians are certified and trained, and that work comes with a service guarantee. Free estimates are available, including by sending photos through WhatsApp; a site visit may incur a travel charge where needed to check measurements or compatibility. LockTop lists 274 positive Google reviews and a 5.0 out of 5 rating.